[R] ANOVA procedure on the sufficient statistics
friendly at yorku.ca
Thu Feb 19 14:45:01 CET 2004
>You can apply the trick that Prof. Dalgaard recently posted in response to a
>similar question (for one-way ANOVA). For each cell, generate data as:
>y <- cell.mean + cell.sd * scale(rnorm(cell.count))
>Then generate the data frame to feed to aov.
That will generate only approximately the same means and MSE, however.
Larsen's procedure generates a weighted data set that gives the same
as the raw data, but requires that the weight= argument be used in aov().
(weights are not supported in all related functions)
Michael Friendly Email: friendly at yorku.ca
Professor, Psychology Dept.
York University Voice: 416 736-5115 x66249 Fax: 416 736-5814
4700 Keele Street http://www.math.yorku.ca/SCS/friendly.html
Toronto, ONT M3J 1P3 CANADA
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