Keith Alan Chamberlain <Keith.Chamberlain <at> Colorado.EDU> writes:
> Cat=c('a','a','a','b','b','b','a','a','b') # Categorical variable
> C1=vector(length=length(Cat)) # New vector for numeric values
> for(i in 1:length(C1)){
> if(Cat[i]=='a') C1[i]=-1 else C1[i]=1
> }
>
> C1
> [1] -1 -1 -1 1 1 1 -1 -1 1
> Cat
> [1] "a" "a" "a" "b" "b" "b" "a" "a" "b"
ifelse(Cat == "a", -1, 1)
[1] -1 -1 -1 1 1 1 -1 -1 1
HTH
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