I am trying to use lme to fit a model with one between subjects factor
"A", in a repeated measures design.
I keep getting
Error in MEEM(object, conLin, control$niterEM) :
Singularity in backsolve at level 0, block 1
There are no obserations in one level of factor A at the last
time. The table of counts are
Time
1 2 3 6
A 1 15 14 15 15
2 20 17 17 0
3 28 26 26 27
4 29 26 28 29
and there is only one observation per subject per time.
I can fit a fixed terms model (ignoring subjects) using lm.
I thought that I should be able to estimate all bar one parameter in
this model.
Any enlightenments would be appreciated.
Ross Darnell
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