search for: correlationstructure

...= ~ session|trapfield), random=~1|field, na.action=na.omit, data=plates, method="ML") Error: Incompatible formulas for groups in "random" and "correlation" What is the problem? thanks a lot! Yvonne -- View this message in context: http://r.789695.n4.nabble.com/lme-correlationstructure-AR1-and-random-factor-tp3416248p3416248.html Sent from the R help mailing list archive at Nabble.com.