Thank you for your reply, it helped. That thread is about glm, I take it that lrm behaves in the same way?!? See: https://stat.ethz.ch/pipermail/r-help/2009-July/204192.html and also other posts in that thread. -- View this message in context: http://www.nabble.com/lrm-in-Design-tp25206737p25209958.html Sent from the R help mailing list archive at Nabble.com.