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Can someone explain why I am getting the following error: in the r code below? Error in solve.default(diag(2) + ((1/currvar) * (XX1 %*% t(XX1)))) : system is computationally singular: reciprocal condition number = 0 In addition: There were 50 or more warnings (use warnings() to see the first 50) The R code is part of a bigger program. ##sample from full conditional

...says Groups: Subjects = 106, Treatment = 3. Should I be worried or is this what to expect?! I was expecting it to be more like an ANOVA table, where the error degrees of freedom should reflect the number of subjects, not all the data points. I can't see the usual differentiation between the numerater and denominator/error degrees of freedom, so am I right in thinking the DF column shows the error degrees of freedom? Or do glmms not work like this? Thank you very much in advance, Charlotte