Hi, Does anyone know if Ordinal package can be used for continuous covariate. In CLMM function, can independent variables be continuous variables? I used all dummy variable as the independent variables, the CLMM function works, but when I added continuous variables in the model, it gave an error. dr0, dr1, ismgdr, ismgyr_t_A are dummy variables, and yr_tch_exp, yr_tch_exp_massignmentpair are continuous variables. mathc.f <- factor(a$mathcontent) b <- clmm(mathc.f ~ dr0 + dr1 + yr_tch_exp + yr_tch_exp_m + ismgdr + ismgyr_t_A + assignmentpair, random=factor(schoolid), data = a, nAGQ =10) However, I got an error: There were 50 or more warnings (use warnings() to see the first 50) Thanks -- View this message in context: http://r.789695.n4.nabble.com/Ordinal-Package-tp3534316p3534316.html Sent from the R help mailing list archive at Nabble.com.