Martin Batholdy
2009-Jun-14 21:02 UTC
[R] estimate the reliability of a scale with dichotomous items
hi, How can I compute a reliability score of a scale consisting only of dichotomous items? thanks for any help!
William Revelle
2009-Jun-14 21:45 UTC
[R] estimate the reliability of a scale with dichotomous items
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! > >______________________________________________ >R-help at r-project.org mailing list >https://stat.ethz.ch/mailman/listinfo/r-help >PLEASE do read the posting guide http://www.R-project.org/posting-guide.html >and provide commented, minimal, self-contained, reproducible code.-- William Revelle http://personality-project.org/revelle.html Professor http://personality-project.org/personality.html Department of Psychology http://www.wcas.northwestern.edu/psych/ Northwestern University http://www.northwestern.edu/ Attend ISSID/ARP:2009 http://issid.org/issid.2009/