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| <div class="subTitle">org.apache.commons.math3.distribution</div> |
| <h2 title="Class WeibullDistribution" class="title">Class WeibullDistribution</h2> |
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| <li> |
| <ul class="inheritance"> |
| <li><a href="../../../../../org/apache/commons/math3/distribution/AbstractRealDistribution.html" title="class in org.apache.commons.math3.distribution">org.apache.commons.math3.distribution.AbstractRealDistribution</a></li> |
| <li> |
| <ul class="inheritance"> |
| <li>org.apache.commons.math3.distribution.WeibullDistribution</li> |
| </ul> |
| </li> |
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| <br> |
| <pre>public class <span class="strong">WeibullDistribution</span> |
| extends <a href="../../../../../org/apache/commons/math3/distribution/AbstractRealDistribution.html" title="class in org.apache.commons.math3.distribution">AbstractRealDistribution</a></pre> |
| <div class="block">Implementation of the Weibull distribution. This implementation uses the |
| two parameter form of the distribution defined by |
| <a href="http://mathworld.wolfram.com/WeibullDistribution.html"> |
| Weibull Distribution</a>, equations (1) and (2).</div> |
| <dl><dt><span class="strong">Since:</span></dt> |
| <dd>1.1 (changed to concrete class in 3.0)</dd> |
| <dt><span class="strong">Version:</span></dt> |
| <dd>$Id: WeibullDistribution.java 1538998 2013-11-05 13:51:24Z erans $</dd> |
| <dt><span class="strong">See Also:</span></dt><dd><a href="http://en.wikipedia.org/wiki/Weibull_distribution">Weibull distribution (Wikipedia)</a>, |
| <a href="http://mathworld.wolfram.com/WeibullDistribution.html">Weibull distribution (MathWorld)</a>, |
| <a href="../../../../../serialized-form.html#org.apache.commons.math3.distribution.WeibullDistribution">Serialized Form</a></dd></dl> |
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| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colLast" scope="col">Field and Description</th> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>static double</code></td> |
| <td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/distribution/WeibullDistribution.html#DEFAULT_INVERSE_ABSOLUTE_ACCURACY">DEFAULT_INVERSE_ABSOLUTE_ACCURACY</a></strong></code> |
| <div class="block">Default inverse cumulative probability accuracy.</div> |
| </td> |
| </tr> |
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| <h3>Fields inherited from class org.apache.commons.math3.distribution.<a href="../../../../../org/apache/commons/math3/distribution/AbstractRealDistribution.html" title="class in org.apache.commons.math3.distribution">AbstractRealDistribution</a></h3> |
| <code><a href="../../../../../org/apache/commons/math3/distribution/AbstractRealDistribution.html#random">random</a>, <a href="../../../../../org/apache/commons/math3/distribution/AbstractRealDistribution.html#randomData">randomData</a>, <a href="../../../../../org/apache/commons/math3/distribution/AbstractRealDistribution.html#SOLVER_DEFAULT_ABSOLUTE_ACCURACY">SOLVER_DEFAULT_ABSOLUTE_ACCURACY</a></code></li> |
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| <th class="colOne" scope="col">Constructor and Description</th> |
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| <tr class="altColor"> |
| <td class="colOne"><code><strong><a href="../../../../../org/apache/commons/math3/distribution/WeibullDistribution.html#WeibullDistribution(double, double)">WeibullDistribution</a></strong>(double alpha, |
| double beta)</code> |
| <div class="block">Create a Weibull distribution with the given shape and scale and a |
| location equal to zero.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colOne"><code><strong><a href="../../../../../org/apache/commons/math3/distribution/WeibullDistribution.html#WeibullDistribution(double, double, double)">WeibullDistribution</a></strong>(double alpha, |
| double beta, |
| double inverseCumAccuracy)</code> |
| <div class="block">Create a Weibull distribution with the given shape, scale and inverse |
| cumulative probability accuracy and a location equal to zero.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colOne"><code><strong><a href="../../../../../org/apache/commons/math3/distribution/WeibullDistribution.html#WeibullDistribution(org.apache.commons.math3.random.RandomGenerator, double, double)">WeibullDistribution</a></strong>(<a href="../../../../../org/apache/commons/math3/random/RandomGenerator.html" title="interface in org.apache.commons.math3.random">RandomGenerator</a> rng, |
| double alpha, |
| double beta)</code> |
| <div class="block">Creates a Weibull distribution.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colOne"><code><strong><a href="../../../../../org/apache/commons/math3/distribution/WeibullDistribution.html#WeibullDistribution(org.apache.commons.math3.random.RandomGenerator, double, double, double)">WeibullDistribution</a></strong>(<a href="../../../../../org/apache/commons/math3/random/RandomGenerator.html" title="interface in org.apache.commons.math3.random">RandomGenerator</a> rng, |
| double alpha, |
| double beta, |
| double inverseCumAccuracy)</code> |
| <div class="block">Creates a Weibull distribution.</div> |
| </td> |
| </tr> |
| </table> |
| </li> |
| </ul> |
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| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colLast" scope="col">Method and Description</th> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>protected double</code></td> |
| <td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/distribution/WeibullDistribution.html#calculateNumericalMean()">calculateNumericalMean</a></strong>()</code> |
| <div class="block">used by <a href="../../../../../org/apache/commons/math3/distribution/WeibullDistribution.html#getNumericalMean()"><code>getNumericalMean()</code></a></div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>protected double</code></td> |
| <td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/distribution/WeibullDistribution.html#calculateNumericalVariance()">calculateNumericalVariance</a></strong>()</code> |
| <div class="block">used by <a href="../../../../../org/apache/commons/math3/distribution/WeibullDistribution.html#getNumericalVariance()"><code>getNumericalVariance()</code></a></div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>double</code></td> |
| <td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/distribution/WeibullDistribution.html#cumulativeProbability(double)">cumulativeProbability</a></strong>(double x)</code> |
| <div class="block">For a random variable <code>X</code> whose values are distributed according |
| to this distribution, this method returns <code>P(X <= x)</code>.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>double</code></td> |
| <td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/distribution/WeibullDistribution.html#density(double)">density</a></strong>(double x)</code> |
| <div class="block">Returns the probability density function (PDF) of this distribution |
| evaluated at the specified point <code>x</code>.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>double</code></td> |
| <td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/distribution/WeibullDistribution.html#getNumericalMean()">getNumericalMean</a></strong>()</code> |
| <div class="block">Use this method to get the numerical value of the mean of this |
| distribution.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>double</code></td> |
| <td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/distribution/WeibullDistribution.html#getNumericalVariance()">getNumericalVariance</a></strong>()</code> |
| <div class="block">Use this method to get the numerical value of the variance of this |
| distribution.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>double</code></td> |
| <td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/distribution/WeibullDistribution.html#getScale()">getScale</a></strong>()</code> |
| <div class="block">Access the scale parameter, <code>beta</code>.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>double</code></td> |
| <td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/distribution/WeibullDistribution.html#getShape()">getShape</a></strong>()</code> |
| <div class="block">Access the shape parameter, <code>alpha</code>.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>protected double</code></td> |
| <td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/distribution/WeibullDistribution.html#getSolverAbsoluteAccuracy()">getSolverAbsoluteAccuracy</a></strong>()</code> |
| <div class="block">Return the absolute accuracy setting of the solver used to estimate |
| inverse cumulative probabilities.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>double</code></td> |
| <td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/distribution/WeibullDistribution.html#getSupportLowerBound()">getSupportLowerBound</a></strong>()</code> |
| <div class="block">Access the lower bound of the support.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>double</code></td> |
| <td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/distribution/WeibullDistribution.html#getSupportUpperBound()">getSupportUpperBound</a></strong>()</code> |
| <div class="block">Access the upper bound of the support.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>double</code></td> |
| <td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/distribution/WeibullDistribution.html#inverseCumulativeProbability(double)">inverseCumulativeProbability</a></strong>(double p)</code> |
| <div class="block">Computes the quantile function of this distribution.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/distribution/WeibullDistribution.html#isSupportConnected()">isSupportConnected</a></strong>()</code> |
| <div class="block">Use this method to get information about whether the support is connected, |
| i.e.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/distribution/WeibullDistribution.html#isSupportLowerBoundInclusive()">isSupportLowerBoundInclusive</a></strong>()</code> |
| <div class="block">Whether or not the lower bound of support is in the domain of the density |
| function.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/distribution/WeibullDistribution.html#isSupportUpperBoundInclusive()">isSupportUpperBoundInclusive</a></strong>()</code> |
| <div class="block">Whether or not the upper bound of support is in the domain of the density |
| function.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>double</code></td> |
| <td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/distribution/WeibullDistribution.html#logDensity(double)">logDensity</a></strong>(double x)</code> |
| <div class="block">Returns the natural logarithm of the probability density function (PDF) of this distribution |
| evaluated at the specified point <code>x</code>.</div> |
| </td> |
| </tr> |
| </table> |
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| <h3>Methods inherited from class org.apache.commons.math3.distribution.<a href="../../../../../org/apache/commons/math3/distribution/AbstractRealDistribution.html" title="class in org.apache.commons.math3.distribution">AbstractRealDistribution</a></h3> |
| <code><a href="../../../../../org/apache/commons/math3/distribution/AbstractRealDistribution.html#cumulativeProbability(double, double)">cumulativeProbability</a>, <a href="../../../../../org/apache/commons/math3/distribution/AbstractRealDistribution.html#probability(double)">probability</a>, <a href="../../../../../org/apache/commons/math3/distribution/AbstractRealDistribution.html#probability(double, double)">probability</a>, <a href="../../../../../org/apache/commons/math3/distribution/AbstractRealDistribution.html#reseedRandomGenerator(long)">reseedRandomGenerator</a>, <a href="../../../../../org/apache/commons/math3/distribution/AbstractRealDistribution.html#sample()">sample</a>, <a href="../../../../../org/apache/commons/math3/distribution/AbstractRealDistribution.html#sample(int)">sample</a></code></li> |
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| <code><a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#clone()" title="class or interface in java.lang">clone</a>, <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#equals(java.lang.Object)" title="class or interface in java.lang">equals</a>, <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#finalize()" title="class or interface in java.lang">finalize</a>, <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#getClass()" title="class or interface in java.lang">getClass</a>, <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#hashCode()" title="class or interface in java.lang">hashCode</a>, <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#notify()" title="class or interface in java.lang">notify</a>, <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#notifyAll()" title="class or interface in java.lang">notifyAll</a>, <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#toString()" title="class or interface in java.lang">toString</a>, <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#wait()" title="class or interface in java.lang">wait</a>, <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#wait(long)" title="class or interface in java.lang">wait</a>, <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#wait(long, int)" title="class or interface in java.lang">wait</a></code></li> |
| </ul> |
| </li> |
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| <h3>Field Detail</h3> |
| <a name="DEFAULT_INVERSE_ABSOLUTE_ACCURACY"> |
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| </a> |
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| <li class="blockList"> |
| <h4>DEFAULT_INVERSE_ABSOLUTE_ACCURACY</h4> |
| <pre>public static final double DEFAULT_INVERSE_ABSOLUTE_ACCURACY</pre> |
| <div class="block">Default inverse cumulative probability accuracy.</div> |
| <dl><dt><span class="strong">Since:</span></dt> |
| <dd>2.1</dd> |
| <dt><span class="strong">See Also:</span></dt><dd><a href="../../../../../constant-values.html#org.apache.commons.math3.distribution.WeibullDistribution.DEFAULT_INVERSE_ABSOLUTE_ACCURACY">Constant Field Values</a></dd></dl> |
| </li> |
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| <a name="WeibullDistribution(double, double)"> |
| <!-- --> |
| </a> |
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| <h4>WeibullDistribution</h4> |
| <pre>public WeibullDistribution(double alpha, |
| double beta) |
| throws <a href="../../../../../org/apache/commons/math3/exception/NotStrictlyPositiveException.html" title="class in org.apache.commons.math3.exception">NotStrictlyPositiveException</a></pre> |
| <div class="block">Create a Weibull distribution with the given shape and scale and a |
| location equal to zero.</div> |
| <dl><dt><span class="strong">Parameters:</span></dt><dd><code>alpha</code> - Shape parameter.</dd><dd><code>beta</code> - Scale parameter.</dd> |
| <dt><span class="strong">Throws:</span></dt> |
| <dd><code><a href="../../../../../org/apache/commons/math3/exception/NotStrictlyPositiveException.html" title="class in org.apache.commons.math3.exception">NotStrictlyPositiveException</a></code> - if <code>alpha <= 0</code> or |
| <code>beta <= 0</code>.</dd></dl> |
| </li> |
| </ul> |
| <a name="WeibullDistribution(double, double, double)"> |
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| </a> |
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| <h4>WeibullDistribution</h4> |
| <pre>public WeibullDistribution(double alpha, |
| double beta, |
| double inverseCumAccuracy)</pre> |
| <div class="block">Create a Weibull distribution with the given shape, scale and inverse |
| cumulative probability accuracy and a location equal to zero.</div> |
| <dl><dt><span class="strong">Parameters:</span></dt><dd><code>alpha</code> - Shape parameter.</dd><dd><code>beta</code> - Scale parameter.</dd><dd><code>inverseCumAccuracy</code> - Maximum absolute error in inverse |
| cumulative probability estimates |
| (defaults to <a href="../../../../../org/apache/commons/math3/distribution/WeibullDistribution.html#DEFAULT_INVERSE_ABSOLUTE_ACCURACY"><code>DEFAULT_INVERSE_ABSOLUTE_ACCURACY</code></a>).</dd> |
| <dt><span class="strong">Throws:</span></dt> |
| <dd><code><a href="../../../../../org/apache/commons/math3/exception/NotStrictlyPositiveException.html" title="class in org.apache.commons.math3.exception">NotStrictlyPositiveException</a></code> - if <code>alpha <= 0</code> or |
| <code>beta <= 0</code>.</dd><dt><span class="strong">Since:</span></dt> |
| <dd>2.1</dd></dl> |
| </li> |
| </ul> |
| <a name="WeibullDistribution(org.apache.commons.math3.random.RandomGenerator, double, double)"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
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| <h4>WeibullDistribution</h4> |
| <pre>public WeibullDistribution(<a href="../../../../../org/apache/commons/math3/random/RandomGenerator.html" title="interface in org.apache.commons.math3.random">RandomGenerator</a> rng, |
| double alpha, |
| double beta) |
| throws <a href="../../../../../org/apache/commons/math3/exception/NotStrictlyPositiveException.html" title="class in org.apache.commons.math3.exception">NotStrictlyPositiveException</a></pre> |
| <div class="block">Creates a Weibull distribution.</div> |
| <dl><dt><span class="strong">Parameters:</span></dt><dd><code>rng</code> - Random number generator.</dd><dd><code>alpha</code> - Shape parameter.</dd><dd><code>beta</code> - Scale parameter.</dd> |
| <dt><span class="strong">Throws:</span></dt> |
| <dd><code><a href="../../../../../org/apache/commons/math3/exception/NotStrictlyPositiveException.html" title="class in org.apache.commons.math3.exception">NotStrictlyPositiveException</a></code> - if <code>alpha <= 0</code> or <code>beta <= 0</code>.</dd><dt><span class="strong">Since:</span></dt> |
| <dd>3.3</dd></dl> |
| </li> |
| </ul> |
| <a name="WeibullDistribution(org.apache.commons.math3.random.RandomGenerator, double, double, double)"> |
| <!-- --> |
| </a> |
| <ul class="blockListLast"> |
| <li class="blockList"> |
| <h4>WeibullDistribution</h4> |
| <pre>public WeibullDistribution(<a href="../../../../../org/apache/commons/math3/random/RandomGenerator.html" title="interface in org.apache.commons.math3.random">RandomGenerator</a> rng, |
| double alpha, |
| double beta, |
| double inverseCumAccuracy) |
| throws <a href="../../../../../org/apache/commons/math3/exception/NotStrictlyPositiveException.html" title="class in org.apache.commons.math3.exception">NotStrictlyPositiveException</a></pre> |
| <div class="block">Creates a Weibull distribution.</div> |
| <dl><dt><span class="strong">Parameters:</span></dt><dd><code>rng</code> - Random number generator.</dd><dd><code>alpha</code> - Shape parameter.</dd><dd><code>beta</code> - Scale parameter.</dd><dd><code>inverseCumAccuracy</code> - Maximum absolute error in inverse |
| cumulative probability estimates |
| (defaults to <a href="../../../../../org/apache/commons/math3/distribution/WeibullDistribution.html#DEFAULT_INVERSE_ABSOLUTE_ACCURACY"><code>DEFAULT_INVERSE_ABSOLUTE_ACCURACY</code></a>).</dd> |
| <dt><span class="strong">Throws:</span></dt> |
| <dd><code><a href="../../../../../org/apache/commons/math3/exception/NotStrictlyPositiveException.html" title="class in org.apache.commons.math3.exception">NotStrictlyPositiveException</a></code> - if <code>alpha <= 0</code> or <code>beta <= 0</code>.</dd><dt><span class="strong">Since:</span></dt> |
| <dd>3.1</dd></dl> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| <!-- ============ METHOD DETAIL ========== --> |
| <ul class="blockList"> |
| <li class="blockList"><a name="method_detail"> |
| <!-- --> |
| </a> |
| <h3>Method Detail</h3> |
| <a name="getShape()"> |
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| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>getShape</h4> |
| <pre>public double getShape()</pre> |
| <div class="block">Access the shape parameter, <code>alpha</code>.</div> |
| <dl><dt><span class="strong">Returns:</span></dt><dd>the shape parameter, <code>alpha</code>.</dd></dl> |
| </li> |
| </ul> |
| <a name="getScale()"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>getScale</h4> |
| <pre>public double getScale()</pre> |
| <div class="block">Access the scale parameter, <code>beta</code>.</div> |
| <dl><dt><span class="strong">Returns:</span></dt><dd>the scale parameter, <code>beta</code>.</dd></dl> |
| </li> |
| </ul> |
| <a name="density(double)"> |
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| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>density</h4> |
| <pre>public double density(double x)</pre> |
| <div class="block">Returns the probability density function (PDF) of this distribution |
| evaluated at the specified point <code>x</code>. In general, the PDF is |
| the derivative of the <a href="../../../../../org/apache/commons/math3/distribution/RealDistribution.html#cumulativeProbability(double)"><code>CDF</code></a>. |
| If the derivative does not exist at <code>x</code>, then an appropriate |
| replacement should be returned, e.g. <code>Double.POSITIVE_INFINITY</code>, |
| <code>Double.NaN</code>, or the limit inferior or limit superior of the |
| difference quotient.</div> |
| <dl><dt><span class="strong">Parameters:</span></dt><dd><code>x</code> - the point at which the PDF is evaluated</dd> |
| <dt><span class="strong">Returns:</span></dt><dd>the value of the probability density function at point <code>x</code></dd></dl> |
| </li> |
| </ul> |
| <a name="logDensity(double)"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>logDensity</h4> |
| <pre>public double logDensity(double x)</pre> |
| <div class="block">Returns the natural logarithm of the probability density function (PDF) of this distribution |
| evaluated at the specified point <code>x</code>. In general, the PDF is the derivative of the |
| <a href="../../../../../org/apache/commons/math3/distribution/RealDistribution.html#cumulativeProbability(double)"><code>CDF</code></a>. If the derivative does not exist at <code>x</code>, |
| then an appropriate replacement should be returned, e.g. <code>Double.POSITIVE_INFINITY</code>, |
| <code>Double.NaN</code>, or the limit inferior or limit superior of the difference quotient. Note |
| that due to the floating point precision and under/overflow issues, this method will for some |
| distributions be more precise and faster than computing the logarithm of |
| <a href="../../../../../org/apache/commons/math3/distribution/RealDistribution.html#density(double)"><code>RealDistribution.density(double)</code></a>. The default implementation simply computes the logarithm of |
| <code>density(x)</code>.</div> |
| <dl> |
| <dt><strong>Overrides:</strong></dt> |
| <dd><code><a href="../../../../../org/apache/commons/math3/distribution/AbstractRealDistribution.html#logDensity(double)">logDensity</a></code> in class <code><a href="../../../../../org/apache/commons/math3/distribution/AbstractRealDistribution.html" title="class in org.apache.commons.math3.distribution">AbstractRealDistribution</a></code></dd> |
| <dt><span class="strong">Parameters:</span></dt><dd><code>x</code> - the point at which the PDF is evaluated</dd> |
| <dt><span class="strong">Returns:</span></dt><dd>the logarithm of the value of the probability density function at point <code>x</code></dd></dl> |
| </li> |
| </ul> |
| <a name="cumulativeProbability(double)"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>cumulativeProbability</h4> |
| <pre>public double cumulativeProbability(double x)</pre> |
| <div class="block">For a random variable <code>X</code> whose values are distributed according |
| to this distribution, this method returns <code>P(X <= x)</code>. In other |
| words, this method represents the (cumulative) distribution function |
| (CDF) for this distribution.</div> |
| <dl><dt><span class="strong">Parameters:</span></dt><dd><code>x</code> - the point at which the CDF is evaluated</dd> |
| <dt><span class="strong">Returns:</span></dt><dd>the probability that a random variable with this |
| distribution takes a value less than or equal to <code>x</code></dd></dl> |
| </li> |
| </ul> |
| <a name="inverseCumulativeProbability(double)"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>inverseCumulativeProbability</h4> |
| <pre>public double inverseCumulativeProbability(double p)</pre> |
| <div class="block">Computes the quantile function of this distribution. For a random |
| variable <code>X</code> distributed according to this distribution, the |
| returned value is |
| <ul> |
| <li><code>inf{x in R | P(X<=x) >= p}</code> for <code>0 < p <= 1</code>,</li> |
| <li><code>inf{x in R | P(X<=x) > 0}</code> for <code>p = 0</code>.</li> |
| </ul> |
| |
| The default implementation returns |
| <ul> |
| <li><a href="../../../../../org/apache/commons/math3/distribution/RealDistribution.html#getSupportLowerBound()"><code>RealDistribution.getSupportLowerBound()</code></a> for <code>p = 0</code>,</li> |
| <li><a href="../../../../../org/apache/commons/math3/distribution/RealDistribution.html#getSupportUpperBound()"><code>RealDistribution.getSupportUpperBound()</code></a> for <code>p = 1</code>.</li> |
| </ul> |
| |
| Returns <code>0</code> when <code>p == 0</code> and |
| <code>Double.POSITIVE_INFINITY</code> when <code>p == 1</code>.</div> |
| <dl> |
| <dt><strong>Specified by:</strong></dt> |
| <dd><code><a href="../../../../../org/apache/commons/math3/distribution/RealDistribution.html#inverseCumulativeProbability(double)">inverseCumulativeProbability</a></code> in interface <code><a href="../../../../../org/apache/commons/math3/distribution/RealDistribution.html" title="interface in org.apache.commons.math3.distribution">RealDistribution</a></code></dd> |
| <dt><strong>Overrides:</strong></dt> |
| <dd><code><a href="../../../../../org/apache/commons/math3/distribution/AbstractRealDistribution.html#inverseCumulativeProbability(double)">inverseCumulativeProbability</a></code> in class <code><a href="../../../../../org/apache/commons/math3/distribution/AbstractRealDistribution.html" title="class in org.apache.commons.math3.distribution">AbstractRealDistribution</a></code></dd> |
| <dt><span class="strong">Parameters:</span></dt><dd><code>p</code> - the cumulative probability</dd> |
| <dt><span class="strong">Returns:</span></dt><dd>the smallest <code>p</code>-quantile of this distribution |
| (largest 0-quantile for <code>p = 0</code>)</dd></dl> |
| </li> |
| </ul> |
| <a name="getSolverAbsoluteAccuracy()"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>getSolverAbsoluteAccuracy</h4> |
| <pre>protected double getSolverAbsoluteAccuracy()</pre> |
| <div class="block">Return the absolute accuracy setting of the solver used to estimate |
| inverse cumulative probabilities.</div> |
| <dl> |
| <dt><strong>Overrides:</strong></dt> |
| <dd><code><a href="../../../../../org/apache/commons/math3/distribution/AbstractRealDistribution.html#getSolverAbsoluteAccuracy()">getSolverAbsoluteAccuracy</a></code> in class <code><a href="../../../../../org/apache/commons/math3/distribution/AbstractRealDistribution.html" title="class in org.apache.commons.math3.distribution">AbstractRealDistribution</a></code></dd> |
| <dt><span class="strong">Returns:</span></dt><dd>the solver absolute accuracy.</dd><dt><span class="strong">Since:</span></dt> |
| <dd>2.1</dd></dl> |
| </li> |
| </ul> |
| <a name="getNumericalMean()"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>getNumericalMean</h4> |
| <pre>public double getNumericalMean()</pre> |
| <div class="block">Use this method to get the numerical value of the mean of this |
| distribution. |
| |
| The mean is <code>scale * Gamma(1 + (1 / shape))</code>, where <code>Gamma()</code> |
| is the Gamma-function.</div> |
| <dl><dt><span class="strong">Returns:</span></dt><dd>the mean or <code>Double.NaN</code> if it is not defined</dd></dl> |
| </li> |
| </ul> |
| <a name="calculateNumericalMean()"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>calculateNumericalMean</h4> |
| <pre>protected double calculateNumericalMean()</pre> |
| <div class="block">used by <a href="../../../../../org/apache/commons/math3/distribution/WeibullDistribution.html#getNumericalMean()"><code>getNumericalMean()</code></a></div> |
| <dl><dt><span class="strong">Returns:</span></dt><dd>the mean of this distribution</dd></dl> |
| </li> |
| </ul> |
| <a name="getNumericalVariance()"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>getNumericalVariance</h4> |
| <pre>public double getNumericalVariance()</pre> |
| <div class="block">Use this method to get the numerical value of the variance of this |
| distribution. |
| |
| The variance is <code>scale^2 * Gamma(1 + (2 / shape)) - mean^2</code> |
| where <code>Gamma()</code> is the Gamma-function.</div> |
| <dl><dt><span class="strong">Returns:</span></dt><dd>the variance (possibly <code>Double.POSITIVE_INFINITY</code> as |
| for certain cases in <a href="../../../../../org/apache/commons/math3/distribution/TDistribution.html" title="class in org.apache.commons.math3.distribution"><code>TDistribution</code></a>) or <code>Double.NaN</code> if it |
| is not defined</dd></dl> |
| </li> |
| </ul> |
| <a name="calculateNumericalVariance()"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>calculateNumericalVariance</h4> |
| <pre>protected double calculateNumericalVariance()</pre> |
| <div class="block">used by <a href="../../../../../org/apache/commons/math3/distribution/WeibullDistribution.html#getNumericalVariance()"><code>getNumericalVariance()</code></a></div> |
| <dl><dt><span class="strong">Returns:</span></dt><dd>the variance of this distribution</dd></dl> |
| </li> |
| </ul> |
| <a name="getSupportLowerBound()"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>getSupportLowerBound</h4> |
| <pre>public double getSupportLowerBound()</pre> |
| <div class="block">Access the lower bound of the support. This method must return the same |
| value as <code>inverseCumulativeProbability(0)</code>. In other words, this |
| method must return |
| <p><code>inf {x in R | P(X <= x) > 0}</code>.</p> |
| |
| The lower bound of the support is always 0 no matter the parameters.</div> |
| <dl><dt><span class="strong">Returns:</span></dt><dd>lower bound of the support (always 0)</dd></dl> |
| </li> |
| </ul> |
| <a name="getSupportUpperBound()"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>getSupportUpperBound</h4> |
| <pre>public double getSupportUpperBound()</pre> |
| <div class="block">Access the upper bound of the support. This method must return the same |
| value as <code>inverseCumulativeProbability(1)</code>. In other words, this |
| method must return |
| <p><code>inf {x in R | P(X <= x) = 1}</code>.</p> |
| |
| The upper bound of the support is always positive infinity |
| no matter the parameters.</div> |
| <dl><dt><span class="strong">Returns:</span></dt><dd>upper bound of the support (always |
| <code>Double.POSITIVE_INFINITY</code>)</dd></dl> |
| </li> |
| </ul> |
| <a name="isSupportLowerBoundInclusive()"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>isSupportLowerBoundInclusive</h4> |
| <pre>public boolean isSupportLowerBoundInclusive()</pre> |
| <div class="block">Whether or not the lower bound of support is in the domain of the density |
| function. Returns true iff <code>getSupporLowerBound()</code> is finite and |
| <code>density(getSupportLowerBound())</code> returns a non-NaN, non-infinite |
| value.</div> |
| <dl><dt><span class="strong">Returns:</span></dt><dd>true if the lower bound of support is finite and the density |
| function returns a non-NaN, non-infinite value there</dd></dl> |
| </li> |
| </ul> |
| <a name="isSupportUpperBoundInclusive()"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>isSupportUpperBoundInclusive</h4> |
| <pre>public boolean isSupportUpperBoundInclusive()</pre> |
| <div class="block">Whether or not the upper bound of support is in the domain of the density |
| function. Returns true iff <code>getSupportUpperBound()</code> is finite and |
| <code>density(getSupportUpperBound())</code> returns a non-NaN, non-infinite |
| value.</div> |
| <dl><dt><span class="strong">Returns:</span></dt><dd>true if the upper bound of support is finite and the density |
| function returns a non-NaN, non-infinite value there</dd></dl> |
| </li> |
| </ul> |
| <a name="isSupportConnected()"> |
| <!-- --> |
| </a> |
| <ul class="blockListLast"> |
| <li class="blockList"> |
| <h4>isSupportConnected</h4> |
| <pre>public boolean isSupportConnected()</pre> |
| <div class="block">Use this method to get information about whether the support is connected, |
| i.e. whether all values between the lower and upper bound of the support |
| are included in the support. |
| |
| The support of this distribution is connected.</div> |
| <dl><dt><span class="strong">Returns:</span></dt><dd><code>true</code></dd></dl> |
| </li> |
| </ul> |
| </li> |
| </ul> |
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