Statistics Toolbox

nctpdf

Noncentral T probability density function (pdf)

Syntax

• Y = nctpdf(X,V,DELTA)
  

Description

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

Example

Compare the noncentral T pdf with DELTA = 1 to the T pdf with the same number of degrees of freedom (10).

• x = (-5:0.1:5)';
  p1 = nctpdf(x,10,1);
  p = tpdf(x,10);
  plot(x,p,'--',x,p1,'-')
  
  
  

References

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

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

See Also
nctcdf, nctinv, nctrnd, nctstat, pdf

nctinv

nctrnd