Hi, I really appreciate this post and the work you have done on these models. I have a much simpler problem. In trying to set up a simple bayesian IRT model with data that has 37,000 observations with 10 questions each. Every time I try to run the 1PL outlined above, I get the following error: variable id is missing or contains non-integer values r(198). I'm sure this has something to do with the way id is being stored, but I've yet to figure out how to correct this.
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