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From |
"Nick Cox" <n.j.cox@durham.ac.uk> |

To |
<statalist@hsphsun2.harvard.edu> |

Subject |
st: -tableplot- available on SSC |

Date |
Wed, 25 Feb 2004 17:24:18 -0000 |

Thanks to Kit Baum, a new package -tableplot- has been added to SSC. Stata 8 is required. To install, . ssc inst tableplot If this seems like déjà lu, please note that -tableplot- is not -tabplot-. What -tabplot- does is 1 Calculate for a two-way table cell frequencies, fractions or percents 2 Show them as a "table" of bars. It is just a wrapper for -twoway rbar-. What -tableplot- does is different. 1 You have to specify something to be plotted. That must be something that takes just one value for each cell of a two-way table. This has to exist as a variable beforehand. It could be say a set of residuals from a model, or a summary statistic of some response for the cells of a two-factor table. 2 You must choose -rbar-, -rspike-, -rcap- or -rcapsym- as a -twoway- plottype. (I miss an -rdropline- for what have been called lollipop plots, in which the point symbol on the end of a spike emphasises direction: O | | | ------------------------- | | O In the next version I may emulate that anyway.) In these programs, I'm playing in public. Sometimes I draw the graphs, and think "There is no gain over a table here: in fact a table is much better!". Sometimes the graphs make something more evident, or more vivid. Of course, most graphs never make it to the printed page anyway, and a useless graph is just a few seconds' work discarded, once the program exists. But if anyone finds these programs useful (-tabplot- or -tableplot-) I'd appreciate a private note, with comment on what helped. This should find a formal outlet in Stata Journal 4(2) to appear in June. Stata Journal 4(1) includes a piece on graphing distributions and should be out next month. This is also a partly a reaction to mosaic displays or mosaic plots, which can be found in the literature or on the web. There is an excellent introductory tutorial at http://www.stat.auckland.ac.nz/~ihaka/120/Lectures/lecture17.pdf and mosaic plots are available in various other programs (e.g. R, as the provenance above would lead you to expect). It's a very neat idea, and attractive because they extend to multi-way tables. A Stata implementation would be most welcome. In practice they require more getting used to than the rather conservative plots produced by -tabplot- or -tableplot-, as you have to learn to focus not on the area encoding but on lengths along one axis. * * 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/

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