[R] AlgDesign--exact and approximate design
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)
More information about the R-help