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## org.apache.commons.math.distribution
Interface Distribution

All Known Subinterfaces:
  BinomialDistribution, ChiSquaredDistribution, ContinuousDistribution, DiscreteDistribution, ExponentialDistribution, FDistribution, GammaDistribution, HypergeometricDistribution, IntegerDistribution, NormalDistribution, PoissonDistribution, TDistribution

All Known Implementing Classes:
  AbstractContinuousDistribution, AbstractDistribution, AbstractIntegerDistribution, BinomialDistributionImpl, ChiSquaredDistributionImpl, ExponentialDistributionImpl, FDistributionImpl, GammaDistributionImpl, HypergeometricDistributionImpl, NormalDistributionImpl, PoissonDistributionImpl, TDistributionImpl

public interface Distribution

Base interface for probability distributions.

Version:
  $Revision: 1.2 $ $Date: 2004/11/07 20:39:15 $

Method Summary
`double` | `cumulativeProbability(double x)` For a random variable X whose values are distributed according to this distribution, this method returns P(X ≤ x).
`double` | `cumulativeProbability(double x0, double x1)` For a random variable X whose values are distributed according to this distribution, this method returns P(x0 ≤ X ≤ x1).

Method Detail

### cumulativeProbability

    public double cumulativeProbability(double x)
                                 throws MathException

  For a random variable X whose values are distributed according to this distribution, this method returns P(X ≤ x). In other words, this method represents the (cumulative) distribution function, or CDF, for this distribution.

  Parameters:
    `x` - the value at which the distribution function is evaluated.
  Returns:
    the probability that a random variable with this distribution takes a value less than or equal to `x`
  Throws:
    `MathException` - if the cumulative probability can not be computed due to convergence or other numerical errors.

### cumulativeProbability

    public double cumulativeProbability(double x0,
                                        double x1)
                                 throws MathException

  For a random variable X whose values are distributed according to this distribution, this method returns P(x0 ≤ X ≤ x1).

  Parameters:
    `x0` - the (inclusive) lower bound
    `x1` - the (inclusive) upper bound
  Returns:
    the probability that a random variable with this distribution will take a value between `x0` and `x1`, including the endpoints
  Throws:
    `MathException` - if the cumulative probability can not be computed due to convergence or other numerical errors.
    `IllegalArgumentException` - if `x0 > x1`

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Copyright © 2003-2004 The Apache Software Foundation. All Rights Reserved.