tinv

Description

Inverse cumulative distribution function for T distribution

Syntax

double tinv( const double dP, double df, int iTail = TAILED_TEST_DISC_LOWER, int * nFail = NULL )

Parameters

dP

[input] the probability from the required beta distribution.

df

[input] degrees of freedom, must be positive (df1>0 ).

iTail

[input]

1( TAILED_TEST_UPPER )for upper tail,

2( TAILED_TEST_LOWER) for lower tail.

3( TAILED_TEST_TWO_SIGN_IF), the two tail (significance level) probability is returned,.

4( TAILED_TEST_TWO_CONFID), the two tail (confidence interval) probability is returned,

nFail

[output] fail code

Return

Returns the value for inverse cumulative distribution function for T distribution

Examples

EX1

void tinv_ex1()
{
        double dP[]= {0.25, 0.5, 0.75};
        double df = 3;
        for(int ii = 0; ii<3; ii++)
                printf("%f     %f:     %f\n", dP[ii], df, tinv(dP[ii],df));
}

Remark

See Also

finv

header to Include

origin.h

Reference