Sorry about my reply about polytomous regression. "polr" is for fitting multiple levels of an ordinal scale, not the levels of a qualitative categorization. c ------------------------------------------------------------------------- claudia tebaldi NCAR RAP project scientist P.O. Box 3000 (303) 497-2830 Boulder, CO 80307 -------------------------------------------------------------------------- -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in the "body", not the subject !) To: r-help-request at stat.math.ethz.ch _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._