[R] AlgDesign--exact and approximate design

Dieter Menne dieter.menne at menne-biomed.de
Tue Oct 9 16:31:22 CEST 2007

sun <flyhyena <at> yahoo.com.cn> writes:

>   Another question is, I want to measure the main effects and at least two 
> interactions, variables are factors, how do I ensure this in  formula, 
> ~.+v1:v2 +v3:v4 ?

I would give something like the following a try (since you did not tell use
where you use the formula, it may not always work).

library(MASS) # Modified from Venables/Ripley
quine.fit = aov(log(Days+2.5)~(Eth+Sex+Age+Lrn)^2,quine)


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