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This is brilliant help, thank you very much! And thanks for getting back to me so quickly also! Would you mind if I asked a follow-up question? After having some success with models, I am now stuck with another error. This time it says "columns of unequal length in group (calc g18=g19). I've go...

Evening all, I'm a relatively novice MLwiN user so apologies if my query is easily resolved or if there have been lots of previous posts. I'm trying to fit a multilevel multinomial model of couple HIV status on three levels, the individual, the couple, and their district, using data from Lesotho. Ho...