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st: RE: Plots : Gamma density


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: Plots : Gamma density
Date   Tue, 22 Jun 2004 09:58:11 +0100

-gammafit- and -pgamma- are user-written 
commands for two-parameter gamma distributions
from SSC. 

You don't say what p1 is here, perhaps
a typo for x1. 

However, don't use the -fraction- option. The 
defaulty -density- option for -histogram- 
gives the natural scale for comparing with 
a superimposed density function. 

Nick 
n.j.cox@durham.ac.uk 

Naji Nassar
> 
> I want to plot an histogram with gamma density
> pgamma is showing perfect fit..
> 
> but
> 
> gammafit(var1)
> generate x1=gammaden(e(alpha),e(beta),0,var1)
> twoway (histogram var1,fraction) (scatter p1 var1)
>  doesn't fit as expected..

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