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Re: st: histogram with normal distribution modified


From   Maarten buis <maartenbuis@yahoo.co.uk>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: histogram with normal distribution modified
Date   Sun, 9 Mar 2008 22:52:46 +0000 (GMT)

--- Ana Gabriela Guerrero Serdan <ag_guerreroserdan@yahoo.com> wrote:
> Sorry, my mean (not median) is -1 so I want a
> hypothetical normal distribution to be centered around
> 0 not -1. The reason is that I would like to compare
> the distribution of my sample to a hypothetical
> distribution.  So I want to plot both distributions in
> the histogram. 

What about this:

*-------------------- begin example ------------------------
sysuse auto, clear
sum mpg
local sd = r(sd)
hist mpg,                                              ///
   plot(function y = normden(x,30,`sd'), range(12 41)) ///
   legend(order(1 "density"                            ///
                2 "theoretical" "normal"))
*-------------------- end example --------------------------
(For more on how to use examples I sent to the Statalist, see
http://home.fsw.vu.nl/m.buis/stata/exampleFAQ.html )

Hope this helps,
Maarten


-----------------------------------------
Maarten L. Buis
Department of Social Research Methodology
Vrije Universiteit Amsterdam
Boelelaan 1081
1081 HV Amsterdam
The Netherlands

visiting address:
Buitenveldertselaan 3 (Metropolitan), room Z434

+31 20 5986715

http://home.fsw.vu.nl/m.buis/
-----------------------------------------


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