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

To |
statalist@hsphsun2.harvard.edu |

Subject |
RE: st: Before and After Pairwise Plots |

Date |
Fri, 19 Oct 2007 17:14:22 +0100 |

I haven't got a clear picture of what you want to do, but my guess is that it has been programmed already. Install these programs: . ssc inst parplot . ssc inst pairplot . ssc inst linkplot and see if one of those doesn't suit. A closely overlapping question was asked on Monday. I'll repeat some references from that: Cox, N.J. 2006. Assessing agreement of measurements and predictions in geomorphology. Geomorphology 76: 332-346 is a paper discussing a variety of graphical and numerical ways of approaching this. Don't let the apparent restriction to geomorphology trouble you: almost all of the ideas transcend disciplinary boundaries. All the analyses in this paper used Stata. A linked paper in which the Stata side is explicit is Cox, N.J. 2004. Graphing agreement and disagreement. Stata Journal 4: 329-349. In addition, Rino Bellocco gave me this reference at the Stockholm Users' Meeting. It has material on graphics too: Campbell, D. T. and Kenny, D. A. 1999. A Primer on Regression Artefacts. New York: Guilford Press Nick n.j.cox@durham.ac.uk C Rose I'd like to know how to produce a plot that shows how a dependent variable, measured for a number of individuals, changes after an intervention. I have managed to find an FAQ on the topic for older versions of Stata, which explains the situation quite clearly (please see http://www.stata.com/support/faqs/graphics/vplplot.html), as does the referenced paper. I'm using Stata/IC v10. It seems the "twoway pcspike" command is appropriate, but I have two questions about this: 1. This requires one to have data in the form y1 x1 y2 x2. I have two variables: the dependent variable, Y, and a categorical variable that indicates whether the corresponding entry in Y was measured pre- or post-intervention. How can I (easily!) convert my data into the y1 x1 y2 x2 form? (It would be nice if this were to generalise to the case where I have measurements on Y at more than two time points.) 2. How do I get "twoway pcspike" to place the correct categorical label on the x-axis, rather than the values I used in x1 and x2? I can edit the text manually in the graph window, but found that my text ran off the edge of the display. * * 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/

**Follow-Ups**:**Re: st: Before and After Pairwise Plots***From:*C Rose <junk7@microserf.org.uk>

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