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PTREND: Stata module for trend analysis for proportions

  • Patrick Royston


    (MRC Clinical Trials Unit, UK)

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    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.

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    Software component provided by Boston College Department of Economics in its series Statistical Software Components with number S426101.

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    Programming language: Stata
    Requires: Stata version 8
    Date of creation: 29 Oct 2014
    Date of revision:
    Handle: RePEc:boc:bocode:s426101
    Note: This module may be installed from within Stata by typing "ssc install ptrend". Windows users should not attempt to download these files with a web browser.
    Contact details of provider: Postal: Boston College, 140 Commonwealth Avenue, Chestnut Hill MA 02467 USA
    Phone: 617-552-3670
    Fax: +1-617-552-2308
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