[R] summated scale

Ista Zahn istazahn at gmail.com
Sat Mar 20 21:11:40 CET 2010

Hi Anthony,
Have a look at ?rowSums (if you just want to calculate the score) or
?score.items in the psych package (if you want to calculate alpha's,
item-by-scale correlations etc.).


On Sat, Mar 20, 2010 at 4:02 PM, Anthony Lopez <skytrek820 at gmail.com> 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!
>        [[alternative HTML version deleted]]
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Ista Zahn
Graduate student
University of Rochester
Department of Clinical and Social Psychology

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