CONTRAST: Stata module to calculate contrasts between factor levels

Patrick Royston ()
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Patrick Royston: Royal Postgraduate Medical School

Statistical Software Components from Boston College Department of Economics

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.

Language: Stata
Date: 1998-03-20
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Downloads: (external link)
http://fmwww.bc.edu/repec/bocode/c/contrast.ado program code (text/plain)
http://fmwww.bc.edu/repec/bocode/c/contrast.hlp help file (text/plain)
http://fmwww.bc.edu/repec/bocode/c/contrasi.ado program code (text/plain)
http://fmwww.bc.edu/repec/bocode/c/contrasi.hlp help file (text/plain)
http://fmwww.bc.edu/repec/bocode/a/aov1cont.ado program code (text/plain)
http://fmwww.bc.edu/repec/bocode/a/aov1cont.hlp help file (text/plain)
http://fmwww.bc.edu/repec/bocode/_/_jprcout.ado program code (text/plain)

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