Philip He
2006-May-15 18:52 UTC
[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]]
MARK LEEDS
2006-May-15 18:59 UTC
[R] E(1/(X+c)) ? where X ~ Chi-square(n) and c is a constant.
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]]
>
> ______________________________________________
> R-help at stat.math.ethz.ch mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide!
> http://www.R-project.org/posting-guide.html
>