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PTREND: Stata module for trend analysis for proportions

Author

Listed:
  • Patrick Royston

    (MRC Clinical Trials Unit, UK)

Programming Language

Stata

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.

Suggested Citation

  • Patrick Royston, 2014. "PTREND: Stata module for trend analysis for proportions," Statistical Software Components S426101, Boston College Department of Economics.
    • Handle: RePEc:boc:bocode:s426101
    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.
    as

    Download full text from publisher

    File URL: http://fmwww.bc.edu/repec/bocode/p/ptrend.ado
    File Function: program code
    Download Restriction: no
    File URL: http://fmwww.bc.edu/repec/bocode/p/ptrend.sthlp
    File Function: help file
    Download Restriction: no
    File URL: http://fmwww.bc.edu/repec/bocode/p/ptrendi.ado
    File Function: program code
    Download Restriction: no
    File URL: http://fmwww.bc.edu/repec/bocode/p/ptrendi.hlp
    File Function: help file
    Download Restriction: no
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