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RE: st: RE: histogram with overlaid normal error


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   RE: st: RE: histogram with overlaid normal error
Date   Fri, 1 Feb 2008 17:52:04 -0000

I've got to say that I don't think missings could possibly be an issue
here. 
I am still puzzled at why you got what you reported. 

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

Thomas Triebs 

thanks!

it seems it was some missing values that caused a problem for normal but

not for kdensity.

Nick Cox wrote:
> In Stata 10, I tried this 
>
> sysuse auto, clear 
> histogram mpg, by(foreign) normal 
>
> without problem. 
>
> Nick 
> n.j.cox@durham.ac.uk 
>
> Thomas Triebs
>
> the following works fine:
> histogram /varname/, kdensity by(yr)
>
> however when I do the same with a normal distribution:
> histogram /varname/, normal by(yr)
>
> I get the following error:
> error in expression: normden(x,,)*1

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