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Thanks George for your prompt replied! I am afraid that I got the error even when just adding the first covariate in the model so not sure your point will help me here ... I will try to add a covariate and keep using MQL1 and see what happens. Cheers, Julia

I am trying to fit a multinomial 2-level model. When I execute estimation PQL 2 order, I got the following error:

error while obeying batch file C:\Program Files (x86)\MLwiN v2.26\i386\..\multicat\order2a.mc at line number 20:
calc ‘f~~(h)’ = ‘f~(h)’*(‘f~(h)’/’pi’-C1177/(1+C1178))

Any ideas ...