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st: Re: RE: Overlaid Curves


From   "Scott Merryman" <smerryman@kc.rr.com>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: Re: RE: Overlaid Curves
Date   Mon, 22 Mar 2004 17:30:41 -0600

I don't believe -twoway function- has an -at()- option.  Perhaps it should
be -range(myvar)- instead:

twoway histogram mpg || function f = normden(x,25,5) , range(mpg)


Scott

----- Original Message ----- 
From: <Miller.DavidJ@epamail.epa.gov>
To: <statalist@hsphsun2.harvard.edu>
Sent: Monday, March 22, 2004 4:57 PM
Subject: st: RE: Overlaid Curves


>
>
>
> Statalisters --
>
> I did try to use  the function command to try to overlay a normal curve
> with a given mean and standard deviation on a histogram but received the
> error message "option at() not allowed".  I tried to emulate Nick's
> syntax  -twoway histogram myvar || function f = normden(x,<mean>,<sd>),
> at(myvar)- substituting "mpg" for "myvar" and "25" and "5" for <mean>
> and <sd>, respectively.  Here is the output from my Stata:
>
>  webuse auto
> (1978 Automobile Data)
>
> . about
>
> Intercooled Stata 8.2 for Windows
> Born 30 Jan 2004
> Copyright (C) 1985-2003
>
>
> . twoway histogram mpg || function f = normden(x,25,5), at(mpg)
> option at() not allowed
> invalid syntax
> r(198);
>
> I am sure I am doing something silly, but can't see what it is.  Can
> anyone help?
>
>
>
>
>
> David Miller
> Office of Pesticide Programs
> U.S. Environmental Protection Agency
> 703-305-5352 (voice)
> 703 605-1289 (fax)
> OPP/Health Effects Division
>

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