0000504: FIXED: minor bug in the sign test (two sided alternative)

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Category

Severity

Reproducibility

Date Submitted

Last Update

0000504

[ALGLIB] Statistics

major

have not tried

2013-02-16 11:00

2013-05-13 14:47

Reporter

SergeyB

View Status

public

Assigned To

SergeyB

Priority

normal

Resolution

fixed

Platform

Status

resolved

Projection

none

OS Version

ETA

none

Fixed in Version

3.8.0

Product Version

Target Version

3.8.0

Product Build

Summary

0000504: FIXED: minor bug in the sign test (two sided alternative)

Description

Sign test returns incorrect value for BothTails (slightly larger than 1.0) when sample has same number of values at both sides of supposed median value.

This bug was reported by Julin Urbano:
> double[] data = new double[] { 1, 2, 3, -4, -5, -6 };
> alglib.onesamplesigntest(data, data.Length, 0, out both, out left, out right);
> and you'll see that the 2-tailed p-value (variable both) is 1.3125,
> which can't happen :-)

Steps To Reproduce

Additional Information

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Unspecified

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Issue History
Date Modified	Username	Field	Change
2013-02-16 11:00	SergeyB	New Issue
2013-02-16 11:00	SergeyB	Status	new => assigned
2013-02-16 11:00	SergeyB	Assigned To	=> SergeyB
2013-02-16 11:00	SergeyB	Programming language	=> Unspecified
2013-05-13 14:47	SergeyB	Summary	Bug in the sign test (two sided alternative) => FIXED: minor bug in the sign test (two sided alternative)
2013-05-13 14:47	SergeyB	Description Updated
2013-05-13 14:47	SergeyB	Status	assigned => resolved
2013-05-13 14:47	SergeyB	Fixed in Version	=> 3.8.0
2013-05-13 14:47	SergeyB	Resolution	open => fixed

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