i don't know it off the top of my head but there's a relation between powers
of the chi squared and the gamma dsitribution.
check it out in casella and berger or arnold.
mark
----- Original Message -----
From: "Philip He" <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Monday, May 15, 2006 2:52 PM
Subject: [R] E(1/(X+c)) ? where X ~ Chi-square(n) and c is a constant.
> Hi all,
>
> Can someone help me with the following expectation in a closed form?
>
> E(1/(X+c))
>
> where X ~ Chi-square(n) and c is a constant.
>
> Thanks.
>
> [[alternative HTML version deleted]]
>
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