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RE: st: histogram with normal distribution modified


From   Ana Gabriela Guerrero Serdan <ag_guerreroserdan@yahoo.com>
To   statalist@hsphsun2.harvard.edu
Subject   RE: st: histogram with normal distribution modified
Date   Wed, 2 Apr 2008 05:44:23 -0700 (PDT)

Thanks Martin and Nick, the theoretical normal
distribution works perfectly! 

regards, 
Gaby 
--- Nick Cox <n.j.cox@durham.ac.uk> wrote:

> Note the simple but crucial detail: you must specify
> an sd as well as a
> mean for 
> a superimposed normal. You could use that of the
> data, but you must
> specify one. 
> 
> Nick 
> 
> Maarten buis
> 
> --- 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 )
> 
> *
> *   For searches and help try:
> *  
> http://www.stata.com/support/faqs/res/findit.html
> *   http://www.stata.com/support/statalist/faq
> *   http://www.ats.ucla.edu/stat/stata/
> 


Gaby Guerrero Serdan 

Deparment of Economics
Royal Holloway, University of London
TW20 OEX
Egham, Surrey
England, UK
http://www.rhul.ac.uk/economics/About-Us/postgrads.html

http://ag.guerreroserdan.googlepages.com/gabyguerrero%27swebpage
http://www.flickr.com/photos/49939890@N00/show/

Tel: +44 7912657259


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