2.1.24.6.4 ocmath_f_test

1 Description
2 Syntax
3 Parameters
4 Return
5 Examples
6 Remark
7 See Also
8 Header to Include
9 Reference

Description

Function to perform a F Test for equal variance.

Syntax

int ocmath_f_test( UINT nSize1, const double * pData1, UINT nSize2, const double * pData2, const HypotTestOptions * opt, FVarResults * res )

Parameters

nSize1: [Input] number of data points in pData1
pData1: [Input] pointers to 1st data points for Two Sample t-Test
nSize2: [Input] number of data points in pData2
pData2: [Input] pointers to 2nd data points for Two Sample t-Test
opt: [Input] structure containing t-Test options
res: [Output] structure containing Chi-Square Test Results

Return

Returns STATS_NO_ERROR on successful exit and a non-zero STATS error code on failure.

Examples

EX1

void f_test_ex1()
{
    vector vData1 = { 1.7, 2.1, 3.9, 7.2, 8.6, 8.5, 7.3, 5.1, 2.8, 1.8, 1.7 };
    vector vData2 = { 3.2, 3.9, 4.9, 5.3, 5.5, 6.2, 6.5, 6.9, 7.5, 8.3, 9.4 };
    vector vLevels = { 90.0, 95.0, 99.0 };
    HypotTestOptions opt;
    FVarResults res;
    double nSize1 = vData1.GetSize();
    double nSize2 = vData2.GetSize();
    opt.TestType = 0;
    opt.HypotValue = 0;
    opt.TailType = TAILED_TEST_LOWER;
    ocmath_f_test(nSize1, vData1, nSize2, vData2, &opt, &res);
    printf("NUM = %d\nDEN = %d\nFValue = %f\nFProb = %f\n", res.FDOFNum, res.FDOFDen, res.FValue, res.FProb );
    ASSERT( res.FDOFNum == 10 );
    ASSERT( res.FDOFDen == 10 );
    ASSERT( round( res.FValue, 2 ) == 2.35 );
    ASSERT( round( res.FProb, 4 ) == 0.9026 );
}