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16 package org.apache.commons.math.distribution;
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19 /**
20 * Base interface for discrete distributions.
21 *
22 * @version $Revision: 155427 $ $Date: 2005-02-26 06:11:52 -0700 (Sat, 26 Feb 2005) $
23 */
24 public interface DiscreteDistribution extends Distribution {
25 /**
26 * For a random variable X whose values are distributed according
27 * to this distribution, this method returns P(X = x). In other words, this
28 * method represents the probability mass function, or PMF for the distribution.
29 *
30 * @param x the value at which the probability mass function is evaluated.
31 * @return the value of the probability mass function at x
32 */
33 double probability(double x);
34 }