Statistics Toolbox

ncx2inv

Inverse of the noncentral chi-square cdf

Syntax

• X = ncx2inv(P,V,DELTA)
  

Description

X = ncx2inv(P,V,DELTA) returns the inverse of the noncentral chi-square cdf with parameters V and DELTA at the corresponding probabilities in P. Vector or matrix inputs for P, V, and DELTA must have the same size, which is also the size of X. A scalar input for P, V, or DELTA is expanded to a constant matrix with the same dimensions as the other inputs.

Algorithm

ncx2inv uses Newton's method to converge to the solution.

Example

• ncx2inv([0.01 0.05 0.1],4,2)
  ans =
      0.4858    1.1498    1.7066
  

References

Evans, M., N. Hastings, and B. Peacock, Statistical Distributions, Second Edition, John Wiley and Sons, 1993. p. 50-52.

Johnson, N., and S. Kotz, Distributions in Statistics: Continuous Univariate Distributions-2, John Wiley and Sons, 1970. pp. 130-148.

See Also
icdf, ncx2cdf, ncx2pdf, ncx2rnd, ncx2stat

ncx2cdf

ncx2pdf