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st: update hangroot available


From   Maarten buis <maartenbuis@yahoo.co.uk>
To   stata list <statalist@hsphsun2.harvard.edu>
Subject   st: update hangroot available
Date   Wed, 18 Nov 2009 03:29:26 -0800 (PST)

Thanks to Kit Baum an update of the -hangroot- package 
is now available on SSC. -hangroot- will produce a 
graph comparing an empirical distribution to a 
theoretical distribution. This is done by "hanging" the 
histogram bars from the empirical distribution from the 
theoretical distribution. This way the deviations from 
the theoretical distribution are represented by the 
deviations from the horizontal line at y=0, which 
makes it easier to spot any patterns in these 
deviations. Moreover, the frequencies are plotted on 
the square root scale, which will make deviations in 
the tails more visable. Examples can be found here: http://www.maartenbuis.nl/software/hangroot.html

As promised in a post to the Statalist yesterday, I 
added in this update the Chi square distribution 
and added the option to specify the values of the 
parameters of the theoretical distribution. 
Previously, -hangroot- only used estimated parameters. 
This new option can be useful when using -hangroot- 
to display results from a simulation, where not only 
the distribution a variable should follow is known, 
but also the parameters of that distribution.

To install it type in Stata -ssc install hangroot-, 
and to up-date type in Stata: 
-ssc install hangroot, replace- or -adoupdate, update-

-- Maarten

--------------------------
Maarten L. Buis
Institut fuer Soziologie
Universitaet Tuebingen
Wilhelmstrasse 36
72074 Tuebingen
Germany

http://www.maartenbuis.nl
--------------------------


      

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