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2.1.24.5.1.16 normcdf

Description

Normal (Gaussian) cdf

double normcdf( const double dX, int iTail = TAILED_TEST_LOWER, int * nFail = NULL )

dX: [input] value of the standard Normal variate .
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] on successful exit, it returns the NAG error code NE_NOERROR; if an error or warning has been detected, then it returns the specific error or warning code.

Returns standardized normal cumulative distribution function

EX1

void normcdf_ex1()
{
	double dX[]= {0.25, 0.5, 0.75};
	for(int ii = 0; ii<3; ii++)
		printf("%f:	%f\n", dX[ii], normcdf(dX[ii]));
}

origin.h