2.1.24.2.3 ocmath_mann_whitney

Description

Performs a Mann-Whitney U test for on two independent samples of possibley unequal size. The main engine is nag_mann_whitney. This is an OriginPro only function.

Syntax

int ocmath_mann_whitney( const double * pData1, const int nSize1, const double * pData2, const int nSize2, const int nTailType, NPHSummary * MannSummary, NPHRanks * MannRanks, NPHStats * MannStats, bool bExact = false )

Parameters

pData1

[input] pointer to 1st data points for Wilcoxon Rank Sum test

nSize1

[input] number of pData1

pData2

[input] pointer to 2nd data points for Wilcoxon Rank Sum test

nSize2

[input] number of pData2

nTailType

[input] value indicates Tail Type. which containing 3 types:

TAILED_TEST_TWO is 0,

TAILED_TEST_UPPER is 1,

TAILED_TEST_LOWER is 2

MannSummary

[output] structure containing summary statistics of the 2 groups

MannSummary[0]: Summary statistics of 1st group

MannSummary[1]: Summary statistics of 2nd group

MannRanks

[output] structure containing Statistics of Ranks

MannRanks[0]: Ranks of 1st group

MannRanks[1]: Ranks of 2nd group

MannStats

[output] structure containing the test statistic and p-value

bExact

[input] Optional Input flag indicates if exact probalility to computed. return false if exact probability fail to be computed

bExact is true: compute the exact probability

bExact is false: compute the approximate probability.

Return

Returns STATS_NO_ERROR on successful exit or an STATS error code on failure.

Examples

EX1

void ocmath_mann_whitney_ex1()
{
    vector pData1 = {1.0, 2.3, 4.5, 2.0, 5.3};
    int nSize1 = pData1.GetSize();
    vector pData2 = {2.2, 5.6, 4.3, 1.7, 3.8, 1.2};
    int nSize2 = pData2.GetSize();
    int nTailType = TAILED_TEST_TWO;
    NPHSummary MannSummary[2]; 
    NPHRanks MannRanks[2]; 
    NPHStats MannStats;
    bool bExact = true;
    
    int nRet = ocmath_mann_whitney(pData1, nSize1, pData2, nSize2, nTailType, MannSummary, MannRanks, &MannStats, bExact);
    out_int("nRet=", nRet);
}

Remark

See Also

Header to Included

origin.h

Reference