On 20-Feb-08 17:34:33, Smita Pakhale wrote: > Dear All, > I am a novice in R and am working on my thesis for > master's in Epidemiology & Biostatistics. While > calculating Cronbach's alpha for the SF-36 > questionnaire, I got all 8 of them more than 1. Is it > possible to get alpha more than 1. If yes, please help > me understand it. I read about the negative alpha > value on your web postings. It does not answer my > question though. > Thank you. > Sincerely, > Dr. Smita Pakhale, MD > McGill University, Canada
You should not get alpha > 1 if you calculate it by the standard definition. You can of course get negative values which are arbitrarily large. I wonder, therefore, whether a) You have calculated it by an incorrect method or a non-standard definition or b) You have somehow been presented with negative alpha < 1 as positive values > 1. Can you provide more detail about how you obtained the values you are writng about? Best wishes, Ted. -------------------------------------------------------------------- E-Mail: (Ted Harding) <[EMAIL PROTECTED]> Fax-to-email: +44 (0)870 094 0861 Date: 20-Feb-08 Time: 19:55:00 ------------------------------ XFMail ------------------------------ ______________________________________________ R-help@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.
