Re: [R] cross tabulate variables by subject id

Hi Marianne, How about this... ac.ad <- unstack(dat1, choice ~ cond1:cond2)[, c("A.C", "A.D")] acad.xtab <- with(ac.ad, table(A.C, A.D)) Michael On 29 November 2010 20:18, Marianne Promberger wrote: > Dear list, > > I have data like this: > > dat1 <- data.frame(subject=rep(1:10,2), >        

[R] cross tabulate variables by subject id

Dear list, I have data like this: dat1 <- data.frame(subject=rep(1:10,2), cond1=rep(c("A","B"),each=5), cond2=rep(c("C","D"),each=10), choice=sample(0:1,10,replace=TRUE)) I would like to compare subjects' "choice" for (cond1=="A" & cond2==