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Keep math-supplied statistics tied to their internal moments.

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git-svn-id: https://svn.apache.org/repos/asf/commons/proper/math/trunk@1206477 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Phil Steitz 2011-11-26 16:23:02 +00:00
parent 5ee7ecfc4e
commit a5949c6f59
1 changed files with 18 additions and 17 deletions
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35
src/main/java/org/apache/commons/math/stat/descriptive/SummaryStatistics.java
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@ -88,10 +88,10 @@ public class SummaryStatistics implements StatisticalSummary, Serializable {
protected GeometricMean geoMean = new GeometricMean(sumLog);
/** mean of values that have been added */
protected Mean mean = new Mean();
protected Mean mean = new Mean(secondMoment);
/** variance of values that have been added */
protected Variance variance = new Variance();
protected Variance variance = new Variance(secondMoment);
/** Sum statistic implementation - can be reset by setter. */
private StorelessUnivariateStatistic sumImpl = sum;
@ -202,11 +202,7 @@ public class SummaryStatistics implements StatisticalSummary, Serializable {
* @return the mean
*/
public double getMean() {
if (mean == meanImpl) {
return new Mean(secondMoment).getResult();
} else {
return meanImpl.getResult();
}
return meanImpl.getResult();
}
/**
@ -236,11 +232,7 @@ public class SummaryStatistics implements StatisticalSummary, Serializable {
* @return the variance
*/
public double getVariance() {
if (varianceImpl == variance) {
return new Variance(secondMoment).getResult();
} else {
return varianceImpl.getResult();
}
return varianceImpl.getResult();
}
/**
@ -661,20 +653,29 @@ public class SummaryStatistics implements StatisticalSummary, Serializable {
MathUtils.checkNotNull(source);
MathUtils.checkNotNull(dest);
dest.maxImpl = source.maxImpl.copy();
dest.meanImpl = source.meanImpl.copy();
dest.minImpl = source.minImpl.copy();
dest.sumImpl = source.sumImpl.copy();
dest.varianceImpl = source.varianceImpl.copy();
dest.sumLogImpl = source.sumLogImpl.copy();
dest.sumsqImpl = source.sumsqImpl.copy();
dest.secondMoment = source.secondMoment.copy();
dest.n = source.n;
// Keep commons-math supplied statistics with embedded moments in synch
if (source.getVarianceImpl() instanceof Variance) {
dest.varianceImpl = new Variance(dest.secondMoment);
} else {
dest.varianceImpl = source.varianceImpl.copy();
}
if (source.meanImpl instanceof Mean) {
dest.meanImpl = new Mean(dest.secondMoment);
} else {
dest.meanImpl = source.meanImpl.copy();
}
if (source.getGeoMeanImpl() instanceof GeometricMean) {
// Keep geoMeanImpl, sumLogImpl in synch
dest.geoMeanImpl = new GeometricMean((SumOfLogs) dest.sumLogImpl);
} else {
dest.geoMeanImpl = source.geoMeanImpl.copy();
}
SecondMoment.copy(source.secondMoment, dest.secondMoment);
dest.n = source.n;
// Make sure that if stat == statImpl in source, same
// holds in dest; otherwise copy stat