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...I still have a few problems with it. In addition to the issue reported earlier, I'm getting the following error and I was wondering if there's something I can do about it. Error in logLik.reStruct(object, conLin) : Na/NaN/Inf in foreign function call (arg 3) ... Warnings: 1: Singular precistion matrix in level -1, block 4 (...) 4: "" The interaction terms are primed ~ log(dist) * role random = ~ dist | target.utt / prime.utt The family is binomial (logit). I ensured that log(dist) is always [0; 1]. Role is a factor (binary). target.utt and prime.utt are categories as we...