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

Christopher W. Ryan cryan at binghamton.edu
Wed Feb 4 14:50:00 CET 2009

The item.total command in the "multilevel" package will give you what
you want.

Christopher W. Ryan, MD
SUNY Upstate Medical University Clinical Campus at Binghamton
40 Arch Street, Johnson City, NY  13790
PGP public keys available at http://home.stny.rr.com/ryancw/

"If you want to build a ship, don't drum up the men to gather wood,
divide the work and give orders. Instead, teach them to yearn for the
vast and endless sea."  [Antoine de St. Exupery]

achristoffersen wrote:
> Dear all,
> I like the way the Rcmdr package computes reliability. E.g
> reliability(cov(d[,c("q1", "q2", "q3", "q4", "q5", "q6")],
> use="complete.obs"))
> 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
> Andreas

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