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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   Sun, 9 Mar 2008 15:03:56 -0700 (PDT)

Marteen, 

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. 

I will look at the dplot and hangroot. 

thanks, 

--- Maarten buis <maartenbuis@yahoo.co.uk> wrote:

> --- Ana Gabriela Guerrero Serdan
> <ag_guerreroserdan@yahoo.com> wrote:
> > I'm doing a histogram of z-scores. My distribution
> is 
> > skewed to the left median is on -1. I would like
> to
> > show the histogram and a normal distribution but
> the
> > normal distribution going from the mean value 0
> not
> > from the median -1. 
> > 
> > How can move the normal distribution? 
> 
> 1) You don't have to move the normal distribution,
> it
> is already centered around the mean:
> 
> *---------- begin example ---------
> drop _all
> set obs 1000
> gen x = exp(invnormal(uniform()))
> sum x 
> replace x = (x-r(mean))/r(sd)
> hist x, norm
> *----------- end example -----------
> 
> 2) Comparing the hight of the histrogram bars to a 
> curve is a bad way of finding patterns in the 
> deviations from the Gaussian distribution. 
> Alternatives are Nick Cox's -dpplot- and mine 
> -hangroot-. See: -ssc desc dpplot- and 
> -ssc desc hangroot-.
> 
> 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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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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