On Thu, 29 Mar 2007, Klaus Nordhausen wrote:
>
> I was wondering if there are any R functions that give the tail area
> of a sum of chisquare distributions of the type:
> a_1 X_1 + a_2 X_2
> where a_1 and a_2 are constants and X_1 and X_2 are independent chi-square
> variables with different degrees of freedom.
>
pchisqsum() in the "survey" package does this.
-thomas
Thomas Lumley Assoc. Professor, Biostatistics
[EMAIL PROTECTED] University of Washington, Seattle
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