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 data(quine) quine.fit = aov(log(Days+2.5)~(Eth+Sex+Age+Lrn)^2,quine) summary(quine.fit) Dieter ______________________________________________ [email protected] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
