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st: RE: fit chi distribution to continuos variable


From   "Feiveson, Alan H. (JSC-SK311)" <alan.h.feiveson@nasa.gov>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   st: RE: fit chi distribution to continuos variable
Date   Thu, 1 Sep 2011 12:04:53 -0500

Andreas - By a "chi" distribution. do you mean your data are distributed as the square root of a chi-squared random variable? If so , you can just square your values and fit to a gamma or chi-squared distribution using -gammafit- as discussed in the last few days on this list.

To generate random values after you get the gamma or chi-squared parameters, just use -rgamma_ and take the square root.


Al Feiveson

-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Andreas Fagereng
Sent: Thursday, September 01, 2011 11:56 AM
To: statalist@hsphsun2.harvard.edu
Subject: st: fit chi distribution to continuos variable

Dear Listers,

I have a continuos variable, that plotted as a histogram looks
something like a chi-distribution.

Is there a way to get stata to fit such a distribution to my data,
e.g. so that i can draw new numbers from distribution later?


Best
Andreas
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