Dear all, Under version 2.0.0, I get the error below when calling summary() on a lme-object, whereas it works under version 1.9.1 (well, it did last week, before I upgraded). Any help on this? Thx in advance Søren
library(nlme) mf <- formula(Weight~Cu*(Time+I(Time^2)+I(Time^3))) lme1 <- lme(mf, data = dietox, random=~1|Pig) summary(lme1)
Linear mixed-effects model fit by REML
Data: dietox AIC BIC logLik
4748.664 4815.081 -2360.332
Random effects: Formula: ~1 | Pig (Intercept) Residual StdDev: 6.360083 3.116751
Fixed effects: Error in as.vector(x, "list") : cannot coerce to vector
I can't reproduce this problem on a simple example like
library(nlme) example(lme) summary(fm1)
Can you give us more information on your platform, the version of nlme, and perhaps make the data set available on the Internet so we can try to reproduce the problem?
Just as a guess, do you happen to have the lme4 package loaded before loading nlme? The two packages cannot be loaded simultaneously. This is detected if you load them in the order nlme, lme4 but not if you load them in the other order.
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