[R] Evaluating an expression

Hi, I want to create a data frame similar to the following, but greatly scaled up: df <- data.frame(aaa= c("a","b","c"), integer(3), integer(3)) names(df)[2:3] <- paste("var",1:2,sep="") which yields aaa var1 var2 1 a 0 0 2 b 0 0 3 c 0 0 I would not relish having

[R] Multivariate binary response analysis

Greetings ~ I need some assistance determining an appropriate approach to analyzing multivariate binary response data, and how to do it in R. The setting: Data from an assay, wherein 6-hours-post-fertilization zebrafish embryos (n=20, say) are exposed in a vial to a chemical (replicated 3 times