[R] cronbachs alpha - score.items(psych) vs reliability(Rcmdr)

achristoffersen achristoffersen at gmail.com
Wed Feb 4 00:47:27 CET 2009

Dear all,

I like the way the Rcmdr package computes reliability. E.g

reliability(cov(d[,c("q1", "q2", "q3", "q4", "q5", "q6")],

will not only give me the alpha score, but also for each variable,
alpha.score if deleted. However - when writing scripts it's very tiresome to
load the whole Rcmdr GUI just for this purpose. So I'm looking for an
another package that delivers the same feature.

the score.items function in the psych package i find is too complicated (it
requires a keys vector) and it doesn't report the "alpha if deleted" score.

What have I missed when googling for an alternative?

Thx in advance

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