chi2cdf {PEIP}

Chi-Sq CDF

Description

Computes the Chi^2 CDF, using a transformation to N(0,1) on page 333 of Thistead, Elements of Statistical Computing.

Usage

chi2cdf(x, n)

Arguments

x

end value of chi^2 pdf to integrate to. (scalar)

n

degrees of freedom (scalar)

Details

Note that x and m must be scalars.

Value

p

probability that Chi^2 random variable is less than or equal to x (scalar).

Author(s)

Jonathan M. Lees<[e-mail]>

References

Aster, R.C., C.H. Thurber, and B. Borchers, Parameter Estimation and Inverse Problems, Elsevier Academic Press, Amsterdam, 2005.

Examples

x= seq(from=0.1, to=0.9, length=20)
chi2cdf(x , 3)