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st: update -hangroot- available from ssc

From   Maarten buis <[email protected]>
To   stata list <[email protected]>
Subject   st: update -hangroot- available from ssc
Date   Mon, 14 Jan 2008 14:32:25 +0000 (GMT)

Thanks to Kit Baum an update of the -hangroot- package is now available
from -ssc-. To update type -ssc install hangroot, replace- or 
-adoupdate, update-. 

This update adds support for the log-normal, Weibull, gamma, Gumbel,
inverse gamma, Wald, Fisk, Dagum, Singh-Maddala, Generalized Beta II,
and the generalized extreme value distribution. -hangroot- can now also
act as a post-estimation command for every package in the -fit-family
except -dirifit- (Because the Dirichlet distribution is a multivariate
distribution and is thus not suitable for being displayed as a hanging
rootogram). A complete list of members of the -fit-family is shown

-hangroot- creates a hanging rootogram (Tukey 1977, Wainer 1974), which
compares a theoretical distribution with an empirical one, by "hanging"
the histogram from the theoretical distribution, instead of "standing"
the histogram on the x-axis. This way deviations are shown as
deviations from a horizontal line (y=0) instead of deviations from a
curve (the density curve). This makes it easier to spot patterns in the
deviations. Also the y-axis is scaled as the square root of the
frequency instead of the frequency to show deviations in the tails more

-- Maarten

Tukey, John W. (1977), "Exploratory Data Analysis", Addison-Wesley.

Wainer, Howard. (1974), "The Suspended Rootogram and Other Visual
Displays:  An Empirical Validation".  The American Statistician, 28(4),
pp. 143-145.

The following packages of the -fit-familily are supported by 
-hangroot-.  All these packages are available from -ssc-

fiskfit (available soon)

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

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