Alex Herbert created STATISTICS-62:
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Summary: Port o.a.c.math.stat.inference to a
commons-statistics-inference module
Key: STATISTICS-62
URL: https://issues.apache.org/jira/browse/STATISTICS-62
Project: Commons Statistics
Issue Type: New Feature
Affects Versions: 1.0
Reporter: Alex Herbert
The o.a.c.math4.legacy.stat.inference package contains:
{noformat}
AlternativeHypothesis.java
BinomialTest.java
ChiSquareTest.java
GTest.java
InferenceTestUtils.java
KolmogorovSmirnovTest.java
MannWhitneyUTest.java
OneWayAnova.java
TTest.java
WilcoxonSignedRankTest.java{noformat}
The are few dependencies on other math packages. The notable exceptions are:
1. KolmogorovSmirnovTest which requires matrix support. This is for
multiplication of a square matrix to support a matrix power function. This uses
a double matrix and the same code is duplicated for a BigFraction matrix. Such
code can be ported internally to support only the required functions. It can
also drop the defensive copy strategy used by Commons Math in matrices to allow
multiply in-place where appropriate for performance gains.
2. OneWayAnova which collates the sum, sum of squares and count using
SummaryStatistics. This can be done using an internal class. It is possible to
call the test method using already computed SummaryStatistics. The method that
does this using the SummaryStatistics as part of the API can be dropped, or
supported using an interface that returns: getSum, getSumOfSquares, getN.
All the inference Test classes have instance methods but no state. The
InferenceTestUtils is a static class that holds references to a singleton for
each class and provides static methods to pass through the underlying instances.
I suggest changing the test classes to have only static methods and dropping
InferenceTestUtils.
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