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...#39;ve come across a problem in predict.lme. Assigning a model formula to a variable and then using this variable in lme (instead of typing the formula into the formula part of lme) works as expect. However, when performing a predict on the fitted model I gan an error messag - predict.lme (but not predictlm) seems to expect a 'properly' typed in formula and a cannot extract the formula from the variable. THe code below demonstrates this. Is this a known or expected behavour of predict.lme or is this a bug? kind regards, Arne (R-2.1.0) > library(nlme) ... > mod <- distance ~ age...