Hi Anthony,
Perhaps
?rowSums
?apply
?aggregate
?ave
Here is an example:
set.seed(123)
X <- matrix(rnorm(40), ncol = 4)
colnames(X) <- c('x1','x2','x3','x4')
X
x <- rowSums(X)
x
cbind(X, x)
HTH,
Jorge
On Sat, Mar 20, 2010 at 4:02 PM, Anthony Lopez <> wrote:
> hello,
>
> I am new to R (convert from Stata) and I am wondering if there is an R
> command/function for generating a summated scale from, for example, four
> separate variables in a data set. In other words, I want to transform the
> variables x1, x2, x3, and x4 (which have high inter-item reliability) into
> one new summated variable x'. Can't seem to find it in the psy or psych
> package ...
>
> Thanks for any suggestions!
>
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>
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