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From |
Maarten Buis <maartenlbuis@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
st: package -hangroot- revised on SSC |

Date |
Wed, 18 May 2011 18:20:29 +0200 |

Thanks to Kit Baum a new version of the -hangroot- package is now available from SSC. To install type either -ssc install hangroot, replace- or -adoupdate, update-. -hangroot- creates graphs that compare the distribution of a variable with a theoretical distribution (e.g. a normal/Gaussian distribution). It is an improvement on a histogram with a normal curve superimposed on it. By "hanging" the bars from the theoretical distribution, the deviations from that distribution are now the deviations from the horizontal x-axis, which makes it much easier to spot patterns in these deviations. Moreover, large bars (i.e. large counts) tend to be more variable than small bars (small counts), making them hard to compare. By plotting on a square root scale the variances across the different bars tend to become more similar, again helping to find patterns in the deviations from the theoretical distribution. Several examples of these graphs can be found here: http://www.maartenbuis.nl/software/hangroot.html I made the following changes: o I added the logistic distribution as one of the theoretical distributions with which a variable can be compared. The logistic distribution is a symmetric bell-shaped distribution that is a bit more peaked than a normal/Gaussian distribution. o -hangroot- can be used after various distribution fitting programs available from SSC, like -betafit- and -gammafit-. This new version of -hangroot- can now be used with the new alternative parameterization in -gammafit- that also became available today. o I improved the algorithm for finding estimates of the gamma distribution when not using -hangroot- after -gammafit-. o I fixed a bug when using -hangroot- after -betafit- when the -alternative- option was specified in -betafit-. I hope some of you will find these graphs as awesome as I do ;) Maarten -------------------------- Maarten L. Buis Institut fuer Soziologie Universitaet Tuebingen Wilhelmstrasse 36 72074 Tuebingen Germany http://www.maartenbuis.nl -------------------------- * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

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