Thanks Martin and Nick, the theoretical normal
distribution works perfectly!
regards,
Gaby
--- Nick Cox <[email protected]> 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
> <[email protected]> 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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*
* For searches and help try:
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