At 11:02 PM +0200 6/14/09, Martin Batholdy wrote:
hi,
How can I compute a reliability score of a scale consisting only of
dichotomous items?
RSiteSearch("cronbach's alpha") suggests the ltm, psych, psy,
psycho, epicalc, packages (among others).
There are a number of ways of estimating reliability, alpha is the
most common (and perhaps overused). Other ways include MacDonald's
omega_h and omega_t as well as the six estimates of Guttman. I tend
to use the various functions found in psych, but then again, I am
probably biased.
Bill
thanks for any help!
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William Revelle http://personality-project.org/revelle.html
Professor http://personality-project.org/personality.html
Department of Psychology http://www.wcas.northwestern.edu/psych/
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