Hi all,

I've got the following error message:

Error in lme.formula(y ~ X - 1, data = tmp, weights = mycov, random =
myrnd, : nlminb problem, convergence error code = 1
  message = singular convergence (7)


Also, on different data sets, I've got the following:

Warning messages:
1: In logLik.reStruct(object, conLin) :
  Singular precision matrix in level -1, block 3

Could you please shed some lights on this?

Thanks a lot!

	[[alternative HTML version deleted]]

