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| <div class="subTitle">org.apache.commons.math3.distribution</div> |
| <h2 title="Class GeometricDistribution" class="title">Class GeometricDistribution</h2> |
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| <ul class="inheritance"> |
| <li><a href="../../../../../org/apache/commons/math3/distribution/AbstractIntegerDistribution.html" title="class in org.apache.commons.math3.distribution">org.apache.commons.math3.distribution.AbstractIntegerDistribution</a></li> |
| <li> |
| <ul class="inheritance"> |
| <li>org.apache.commons.math3.distribution.GeometricDistribution</li> |
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| <dd><a href="http://docs.oracle.com/javase/6/docs/api/java/io/Serializable.html?is-external=true" title="class or interface in java.io">Serializable</a>, <a href="../../../../../org/apache/commons/math3/distribution/IntegerDistribution.html" title="interface in org.apache.commons.math3.distribution">IntegerDistribution</a></dd> |
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| <pre>public class <span class="strong">GeometricDistribution</span> |
| extends <a href="../../../../../org/apache/commons/math3/distribution/AbstractIntegerDistribution.html" title="class in org.apache.commons.math3.distribution">AbstractIntegerDistribution</a></pre> |
| <div class="block">Implementation of the geometric distribution.</div> |
| <dl><dt><span class="strong">Since:</span></dt> |
| <dd>3.3</dd> |
| <dt><span class="strong">Version:</span></dt> |
| <dd>$Id: GeometricDistribution.java 1533974 2013-10-20 20:42:41Z psteitz $</dd> |
| <dt><span class="strong">See Also:</span></dt><dd><a href="http://en.wikipedia.org/wiki/Geometric_distribution">Geometric distribution (Wikipedia)</a>, |
| <a href="http://mathworld.wolfram.com/GeometricDistribution.html">Geometric Distribution (MathWorld)</a>, |
| <a href="../../../../../serialized-form.html#org.apache.commons.math3.distribution.GeometricDistribution">Serialized Form</a></dd></dl> |
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| <h3>Fields inherited from class org.apache.commons.math3.distribution.<a href="../../../../../org/apache/commons/math3/distribution/AbstractIntegerDistribution.html" title="class in org.apache.commons.math3.distribution">AbstractIntegerDistribution</a></h3> |
| <code><a href="../../../../../org/apache/commons/math3/distribution/AbstractIntegerDistribution.html#random">random</a>, <a href="../../../../../org/apache/commons/math3/distribution/AbstractIntegerDistribution.html#randomData">randomData</a></code></li> |
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| <td class="colOne"><code><strong><a href="../../../../../org/apache/commons/math3/distribution/GeometricDistribution.html#GeometricDistribution(double)">GeometricDistribution</a></strong>(double p)</code> |
| <div class="block">Create a geometric distribution with the given probability of success.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colOne"><code><strong><a href="../../../../../org/apache/commons/math3/distribution/GeometricDistribution.html#GeometricDistribution(org.apache.commons.math3.random.RandomGenerator, double)">GeometricDistribution</a></strong>(<a href="../../../../../org/apache/commons/math3/random/RandomGenerator.html" title="interface in org.apache.commons.math3.random">RandomGenerator</a> rng, |
| double p)</code> |
| <div class="block">Creates a geometric distribution.</div> |
| </td> |
| </tr> |
| </table> |
| </li> |
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| <tr> |
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| <th class="colLast" scope="col">Method and Description</th> |
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| <tr class="altColor"> |
| <td class="colFirst"><code>double</code></td> |
| <td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/distribution/GeometricDistribution.html#cumulativeProbability(int)">cumulativeProbability</a></strong>(int 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/GeometricDistribution.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="altColor"> |
| <td class="colFirst"><code>double</code></td> |
| <td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/distribution/GeometricDistribution.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="rowColor"> |
| <td class="colFirst"><code>double</code></td> |
| <td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/distribution/GeometricDistribution.html#getProbabilityOfSuccess()">getProbabilityOfSuccess</a></strong>()</code> |
| <div class="block">Access the probability of success for this distribution.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>int</code></td> |
| <td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/distribution/GeometricDistribution.html#getSupportLowerBound()">getSupportLowerBound</a></strong>()</code> |
| <div class="block">Access the lower bound of the support.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>int</code></td> |
| <td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/distribution/GeometricDistribution.html#getSupportUpperBound()">getSupportUpperBound</a></strong>()</code> |
| <div class="block">Access the upper bound of the support.</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/GeometricDistribution.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>double</code></td> |
| <td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/distribution/GeometricDistribution.html#logProbability(int)">logProbability</a></strong>(int x)</code> |
| <div class="block">For a random variable <code>X</code> whose values are distributed according to |
| this distribution, this method returns <code>log(P(X = x))</code>, where |
| <code>log</code> is the natural logarithm.</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/GeometricDistribution.html#probability(int)">probability</a></strong>(int 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> |
| </table> |
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| <li class="blockList"><a name="methods_inherited_from_class_org.apache.commons.math3.distribution.AbstractIntegerDistribution"> |
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| <h3>Methods inherited from class org.apache.commons.math3.distribution.<a href="../../../../../org/apache/commons/math3/distribution/AbstractIntegerDistribution.html" title="class in org.apache.commons.math3.distribution">AbstractIntegerDistribution</a></h3> |
| <code><a href="../../../../../org/apache/commons/math3/distribution/AbstractIntegerDistribution.html#cumulativeProbability(int, int)">cumulativeProbability</a>, <a href="../../../../../org/apache/commons/math3/distribution/AbstractIntegerDistribution.html#inverseCumulativeProbability(double)">inverseCumulativeProbability</a>, <a href="../../../../../org/apache/commons/math3/distribution/AbstractIntegerDistribution.html#reseedRandomGenerator(long)">reseedRandomGenerator</a>, <a href="../../../../../org/apache/commons/math3/distribution/AbstractIntegerDistribution.html#sample()">sample</a>, <a href="../../../../../org/apache/commons/math3/distribution/AbstractIntegerDistribution.html#sample(int)">sample</a>, <a href="../../../../../org/apache/commons/math3/distribution/AbstractIntegerDistribution.html#solveInverseCumulativeProbability(double, int, int)">solveInverseCumulativeProbability</a></code></li> |
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| <h4>GeometricDistribution</h4> |
| <pre>public GeometricDistribution(double p)</pre> |
| <div class="block">Create a geometric distribution with the given probability of success.</div> |
| <dl><dt><span class="strong">Parameters:</span></dt><dd><code>p</code> - probability of success.</dd> |
| <dt><span class="strong">Throws:</span></dt> |
| <dd><code><a href="../../../../../org/apache/commons/math3/exception/OutOfRangeException.html" title="class in org.apache.commons.math3.exception">OutOfRangeException</a></code> - if <code>p <= 0</code> or <code>p > 1</code>.</dd></dl> |
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| <a name="GeometricDistribution(org.apache.commons.math3.random.RandomGenerator, double)"> |
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| <h4>GeometricDistribution</h4> |
| <pre>public GeometricDistribution(<a href="../../../../../org/apache/commons/math3/random/RandomGenerator.html" title="interface in org.apache.commons.math3.random">RandomGenerator</a> rng, |
| double p)</pre> |
| <div class="block">Creates a geometric distribution.</div> |
| <dl><dt><span class="strong">Parameters:</span></dt><dd><code>rng</code> - Random number generator.</dd><dd><code>p</code> - Probability of success.</dd> |
| <dt><span class="strong">Throws:</span></dt> |
| <dd><code><a href="../../../../../org/apache/commons/math3/exception/OutOfRangeException.html" title="class in org.apache.commons.math3.exception">OutOfRangeException</a></code> - if <code>p <= 0</code> or <code>p > 1</code>.</dd></dl> |
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| <a name="getProbabilityOfSuccess()"> |
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| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>getProbabilityOfSuccess</h4> |
| <pre>public double getProbabilityOfSuccess()</pre> |
| <div class="block">Access the probability of success for this distribution.</div> |
| <dl><dt><span class="strong">Returns:</span></dt><dd>the probability of success.</dd></dl> |
| </li> |
| </ul> |
| <a name="probability(int)"> |
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| <h4>probability</h4> |
| <pre>public double probability(int 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 probability mass function (PMF) |
| for the distribution.</div> |
| <dl><dt><span class="strong">Parameters:</span></dt><dd><code>x</code> - the point at which the PMF is evaluated</dd> |
| <dt><span class="strong">Returns:</span></dt><dd>the value of the probability mass function at <code>x</code></dd></dl> |
| </li> |
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| <a name="logProbability(int)"> |
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| <h4>logProbability</h4> |
| <pre>public double logProbability(int x)</pre> |
| <div class="block">For a random variable <code>X</code> whose values are distributed according to |
| this distribution, this method returns <code>log(P(X = x))</code>, where |
| <code>log</code> is the natural logarithm. In other words, this method |
| represents the logarithm of the probability mass function (PMF) for the |
| distribution. 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/IntegerDistribution.html#probability(int)"><code>IntegerDistribution.probability(int)</code></a>. |
| <p> |
| The default implementation simply computes the logarithm of <code>probability(x)</code>.</p></div> |
| <dl> |
| <dt><strong>Overrides:</strong></dt> |
| <dd><code><a href="../../../../../org/apache/commons/math3/distribution/AbstractIntegerDistribution.html#logProbability(int)">logProbability</a></code> in class <code><a href="../../../../../org/apache/commons/math3/distribution/AbstractIntegerDistribution.html" title="class in org.apache.commons.math3.distribution">AbstractIntegerDistribution</a></code></dd> |
| <dt><span class="strong">Parameters:</span></dt><dd><code>x</code> - the point at which the PMF is evaluated</dd> |
| <dt><span class="strong">Returns:</span></dt><dd>the logarithm of the value of the probability mass function at <code>x</code></dd></dl> |
| </li> |
| </ul> |
| <a name="cumulativeProbability(int)"> |
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| </a> |
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| <h4>cumulativeProbability</h4> |
| <pre>public double cumulativeProbability(int 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="getNumericalMean()"> |
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| </a> |
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| <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. |
| |
| For probability parameter <code>p</code>, the mean is <code>(1 - p) / p</code>.</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="getNumericalVariance()"> |
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| </a> |
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| <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. |
| |
| For probability parameter <code>p</code>, the variance is |
| <code>(1 - p) / (p * p)</code>.</div> |
| <dl><dt><span class="strong">Returns:</span></dt><dd>the variance (possibly <code>Double.POSITIVE_INFINITY</code> or |
| <code>Double.NaN</code> if it is not defined)</dd></dl> |
| </li> |
| </ul> |
| <a name="getSupportLowerBound()"> |
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| </a> |
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| <li class="blockList"> |
| <h4>getSupportLowerBound</h4> |
| <pre>public int 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 Z | P(X <= x) > 0}</code>.</p> |
| |
| The lower bound of the support is always 0.</div> |
| <dl><dt><span class="strong">Returns:</span></dt><dd>lower bound of the support (always 0)</dd></dl> |
| </li> |
| </ul> |
| <a name="getSupportUpperBound()"> |
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| <h4>getSupportUpperBound</h4> |
| <pre>public int 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 infinite (which we approximate as |
| <code>Integer.MAX_VALUE</code>).</div> |
| <dl><dt><span class="strong">Returns:</span></dt><dd>upper bound of the support (always Integer.MAX_VALUE)</dd></dl> |
| </li> |
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| <a name="isSupportConnected()"> |
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| <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 integers 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> |
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