[R] E(1/(X+c)) ? where X ~ Chi-square(n) and c is a constant.

[MARK LEEDS]

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" <hydinghua at gmail.com>
To: <r-help at stat.math.ethz.ch>
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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