Statistics Toolbox

nctcdf

Noncentral T cumulative distribution function.

Syntax

P = nctcdf(X,NU,DELTA)

Description

P = nctcdf(X,NU,DELTA) computes the noncentral T cdf at each of the values in X using the corresponding degrees of freedom in NU and noncentrality parameters in DELTA. Vector or matrix inputs for X, NU, and DELTA must have the same size, which is also the size of P. A scalar input for X, NU, or DELTA is expanded to a constant matrix with the same dimensions as the other inputs.

Example

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,'-')

References

Evans, M., N. Hastings, and B. Peacock, Statistical Distributions, Second Edition, John Wiley and Sons, 1993. p. 147-148.

Johnson, N., and S. Kotz, Distributions in Statistics: Continuous Univariate Distributions-2, John Wiley and Sons, 1970. pp. 201-219.

See Also
cdf, nctcdf, nctinv, nctpdf, nctrnd, nctstat

ncfstat

nctinv