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CONTRAST: Stata module to calculate contrasts between factor levels

Author

Listed:
  • Patrick Royston

    (Royal Postgraduate Medical School)

Programming Language

Stata

Abstract

contrast calculates contrasts between factor levels or groups of continuous data. The command has two forms. the first form of contrast permits arbitrarily complex analysis of variance or analysis of covariance models, whereas the second form and contrasi (the immediate form) only support one-way analysis of variance models. In all cases the contrast coefficients are `standardized' inside the program by subtraction of their mean, so as to add up to zero. These standardized coefficients are displayed as __a in the output. The output includes a confidence interval for L, a significance test for the hypothesis L = 0, an overall analysis of variance F-test that the group (or fac1) means are equal and the residual standard deviation from the analysis of variance.

Suggested Citation

  • Patrick Royston, 1998. "CONTRAST: Stata module to calculate contrasts between factor levels," Statistical Software Components S337701, Boston College Department of Economics.
    • Handle: RePEc:boc:bocode:s337701
    as

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    File URL: http://fmwww.bc.edu/repec/bocode/c/contrast.ado
    File Function: program code
    Download Restriction: no
    File URL: http://fmwww.bc.edu/repec/bocode/c/contrast.hlp
    File Function: help file
    Download Restriction: no
    File URL: http://fmwww.bc.edu/repec/bocode/c/contrasi.ado
    File Function: program code
    Download Restriction: no
    File URL: http://fmwww.bc.edu/repec/bocode/c/contrasi.hlp
    File Function: help file
    Download Restriction: no
    File URL: http://fmwww.bc.edu/repec/bocode/a/aov1cont.ado
    File Function: program code
    Download Restriction: no
    File URL: http://fmwww.bc.edu/repec/bocode/a/aov1cont.hlp
    File Function: help file
    Download Restriction: no
    File URL: http://fmwww.bc.edu/repec/bocode/_/_jprcout.ado
    File Function: program code
    Download Restriction: no
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    Keywords

    Stata;

    Statistics

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