On 01/09/2010 07:49 AM, Richardson, Patrick wrote:
Let's say I have 8 variables and I want to generate all combinations
of those variables (In pairs, threes fours, etc) to run in multiple linear
regression. Is there a built-in function to do that in R?
Or at a minimum, how could I take those variables and generate all possible
combinations.
Hi Patrick,
Maybe what you want is this:
allComb<-function(x) {
nx<-length(x)
combs<-as.list(x)
for(i in 2:length(x)) {
indices<-combn(1:nx,i)
for(j in 1:dim(indices)[2]) {
xlist<-list(x[indices[,j]])
combs<-c(combs,xlist)
}
}
return(combs)
}
that returns a list of all combinations of all sizes. As David pointed
out, there are going to be a lot of combinations with eight elements.
Jim
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