Function Reference: nctcdf

statistics: p = nctcdf (x, df, delta)
statistics: p = nctcdf (x, df, delta, uflag)

Noncentral T cumulative distribution function (CDF).

p = nctcdf (x, df, delta) returns the noncentral T cdf with df degrees of freedom and noncentrality parameter delta at the values of X.

The size of p is the common size of the input arguments. Scalar input arguments x, df, delta are regarded as constant matrices of the same size as the other inputs.

p = nctcdf (x, df, delta, "upper" returns the upper tail probability of the noncentral T distribution with df degrees of freedom and noncentrality parameter delta at the values in x.

See also: nctinv, nctpdf, nctrnd, nctstat

Source Code: nctcdf

Example: 1

 

 ## Compare the noncentral t cdf with DELTA = 1 to the t cdf
 ## with the same number of degrees of freedom (10).

 x = (-5:0.1:5)';
 p1 = nctcdf (x, 10, 1);
 p = tcdf (x, 10);
 plot (x, p, "-", x, p1, ":")

                    
plotted figure