Use static methods
diff --git a/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/BetaDistributionTest.java b/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/BetaDistributionTest.java
index fa55331..6407324 100644
--- a/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/BetaDistributionTest.java
+++ b/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/BetaDistributionTest.java
@@ -218,7 +218,7 @@
checkSurvivalPrecision(2.0, 6.0, 0.999, 6.994000000000077e-18);
}
- private void checkCumulative(double alpha, double beta, double[] x, double[] cumes) {
+ private static void checkCumulative(double alpha, double beta, double[] x, double[] cumes) {
final BetaDistribution d = new BetaDistribution(alpha, beta);
for (int i = 0; i < x.length; i++) {
Assertions.assertEquals(cumes[i], d.cumulativeProbability(x[i]), 1e-8);
@@ -229,14 +229,14 @@
}
}
- private void checkSurvival(double alpha, double beta, double[] cumes) {
+ private static void checkSurvival(double alpha, double beta, double[] cumes) {
final BetaDistribution d = new BetaDistribution(alpha, beta);
for (int i = 0; i < CUMULATIVE_TEST_POINTS.length; i++) {
Assertions.assertEquals(1 - cumes[i], d.survivalProbability(CUMULATIVE_TEST_POINTS[i]), 1e-8);
}
}
- private void checkCumulativeSurvivalComplement(double alpha, double beta) {
+ private static void checkCumulativeSurvivalComplement(double alpha, double beta) {
final BetaDistribution d = new BetaDistribution(alpha, beta);
for (int i = 0; i < CUMULATIVE_TEST_POINTS.length; i++) {
final double x = CUMULATIVE_TEST_POINTS[i];
@@ -244,7 +244,7 @@
}
}
- private void checkCumulativePrecision(double alpha, double beta, double value, double expected) {
+ private static void checkCumulativePrecision(double alpha, double beta, double value, double expected) {
final double tolerance = 1e-22;
final BetaDistribution d = new BetaDistribution(alpha, beta);
Assertions.assertEquals(
@@ -254,7 +254,7 @@
() -> "cumulative probability not precise at " + value + " for a=" + alpha + " & b=" + beta);
}
- private void checkSurvivalPrecision(double alpha, double beta, double value, double expected) {
+ private static void checkSurvivalPrecision(double alpha, double beta, double value, double expected) {
final double tolerance = 1e-22;
final BetaDistribution d = new BetaDistribution(alpha, beta);
Assertions.assertEquals(
@@ -395,7 +395,7 @@
}
@SuppressWarnings("boxing")
- private void checkDensity(double alpha, double beta, double[] x, double[] expected) {
+ private static void checkDensity(double alpha, double beta, double[] x, double[] expected) {
final BetaDistribution d = new BetaDistribution(alpha, beta);
for (int i = 0; i < x.length; i++) {
final int index = i;
@@ -483,7 +483,7 @@
}
}
- private double gTest(final ContinuousDistribution expectedDistribution, final double[] values) {
+ private static double gTest(final ContinuousDistribution expectedDistribution, final double[] values) {
final int numBins = values.length / 30;
final double[] breaks = new double[numBins];
for (int b = 0; b < breaks.length; b++) {
