PTREND: Stata module for trend analysis for proportions

Patrick Royston ()
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Patrick Royston: MRC Clinical Trials Unit, UK

Statistical Software Components from Boston College Department of Economics

Abstract: ptrend calculates a chi-square statistic for the trend (regression) of pvar on xvar, where pvar is the proportion rvar/(rvar+nrvar). A variable called _prop, containing the values of pvar, is left behind by ptrend. ptrend also gives a chi-square test for departure from the trend line. ptrendi does the same analysis on user-entered data; the proportions are now p1 = r1/(r1+nr1), p2 = r2/(r2+nr2), etc.

Language: Stata
Requires: Stata version 8
Keywords: nonparametric; chi-square test; trend (search for similar items in EconPapers)
Date: 2014-10-29
Note: This module may be installed from within Stata by typing "ssc install ptrend". The module is made available under terms of the GPL v3 (https://www.gnu.org/licenses/gpl-3.0.txt). Windows users should not attempt to download these files with a web browser.
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Downloads: (external link)
http://fmwww.bc.edu/repec/bocode/p/ptrend.ado program code (text/plain)
http://fmwww.bc.edu/repec/bocode/p/ptrend.sthlp help file (text/plain)
http://fmwww.bc.edu/repec/bocode/p/ptrendi.ado program code (text/plain)
http://fmwww.bc.edu/repec/bocode/p/ptrendi.hlp help file (text/plain)

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