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Changed Poisson consistency test to use a fixed seed. 

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/math/trunk@949613 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Phil Steitz 2010-05-30 22:07:31 +00:00
parent aa0d77a177
commit c98ff85082
1 changed files with 6 additions and 5 deletions
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11
src/test/java/org/apache/commons/math/random/RandomDataTest.java
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@ -196,7 +196,7 @@ public class RandomDataTest extends RetryTestCase {
/** /**
* Make sure that empirical distribution of random Poisson(4)'s has P(X <= * Make sure that empirical distribution of random Poisson(4)'s has P(X <=
* 5) close to actual cumulative Poisson probablity and that nextPoisson * 5) close to actual cumulative Poisson probability and that nextPoisson
* fails when mean is non-positive TODO: replace with statistical test, * fails when mean is non-positive TODO: replace with statistical test,
* adding test stat to TestStatistic * adding test stat to TestStatistic
*/ */
@ -260,14 +260,15 @@ public class RandomDataTest extends RetryTestCase {
* to the corresponding expected distribution computed using PoissonDistributionImpl. * to the corresponding expected distribution computed using PoissonDistributionImpl.
* Uses ChiSquare test of goodness of fit to evaluate the null hypothesis that the * Uses ChiSquare test of goodness of fit to evaluate the null hypothesis that the
* distributions are the same. If the null hypothesis can be rejected with confidence * distributions are the same. If the null hypothesis can be rejected with confidence
* 1 - alpha, the check fails. This check will fail randomly with probability alpha. * 1 - alpha, the check fails.
*/ */
public void checkNextPoissonConsistency(double mean) throws Exception { public void checkNextPoissonConsistency(double mean) throws Exception {
// Generate sample values // Generate sample values
int sampleSize = 1000; // Number of deviates to generate final int sampleSize = 1000; // Number of deviates to generate
int minExpectedCount = 7; // Minimum size of expected bin count final int minExpectedCount = 7; // Minimum size of expected bin count
long maxObservedValue = 0; long maxObservedValue = 0;
double alpha = 0.001; // Probability of false failure final double alpha = 0.001; // Probability of false failure
randomData.reSeed(1000); // Reseed randomGenerator to get fixed sequence
Frequency frequency = new Frequency(); Frequency frequency = new Frequency();
for (int i = 0; i < sampleSize; i++) { for (int i = 0; i < sampleSize; i++) {
long value = randomData.nextPoisson(mean); long value = randomData.nextPoisson(mean);