Andrew Robinson and Andy Jaworski both pointed out that polr is in
library MASS. MASS seems to be missing from my installation, and the
former Andrew suggested that I reinstall it.
When I tried help.search('polr'), nothing was found, and when I tried
library(MASS) or require(MASS) the package wasn't found.
Thanks for the help. I'm kind of mystified as to how MASS could not be
installed with 1.8.1 without any errors or warnings, but I will try to
reinstall R.
Peter
Peter L. Flom, PhD
Assistant Director, Statistics and Data Analysis Core
Center for Drug Use and HIV Research
National Development and Research Institutes
71 W. 23rd St
www.peterflom.com
New York, NY 10010
(212) 845-4485 (voice)
(917) 438-0894 (fax)