pnormvar {cdfinv} | R Documentation |
Cumulative distribution function for t distribution
Description
Computes the quantile of the chi-square distribution for n-1 degrees of freedom corresponding to the input value of the sample variance.
Usage
pnormvar(q, sigma2, n)
Arguments
q |
coordinate at which the cdf is to be evaluated (named in accordance with R standards) |
sigma2 |
the assumed normal variance |
n |
the sample size (pass this as an extra argument to cdfinv()) |
Details
Do not call pnormvar() directly. Pass DISTR="normvar" to cdfinv() when computing intervals for the normal variance. The parameter name to be passed to cdfinv() is sigma2. The additional argument n (sample size) is to be passed to cdfinv().
Value
The quantile of the chi-square distribution for n-1 degrees of freedom corresponding to the input value of the sample variance.
Author(s)
Peter E. Freeman, pfreeman@cmu.edu
Examples
cdfinv("normvar","sigma2",14.35,lpb=0,n=22) ## returns 8.493787 29.305942
[Package cdfinv version 0.1.0 Index]