Thanks for your prompt responses. I will look at the readings you sugggest. One quick question, sampling weights can be applied in clmm2? Thank you, Wander -- View this message in context: http://r.789695.n4.nabble.com/Multilevel-analysis-for-ordinal-responses-tp4686057p4686125.html Sent from the R help mailing list archive at Nabble.com.