Steve, when I run the models, I do get 0 df for whatever the first variable in the class statement is. I'm going to try to attach some results. I would paste them in, but for some reason my browser isn't letting me paste into this text box, and I have no other options at the moment. If I remove the weight statement, I suddenly get results that at least appear normal (no infinite t-values, no values for my reference category).
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