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

[Christopher W. Ryan]

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

--Chris
Christopher W. Ryan, MD
SUNY Upstate Medical University Clinical Campus at Binghamton
40 Arch Street, Johnson City, NY  13790
cryanatbinghamtondotedu
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