Thank you!!! Just so I understand, could you please explain why you would only include an interaction term and not the main effects?
Also, I was planning to plot observed data v. the model's predicted probabilities. For the observed data on gender by year for everyone combined, I had planned to drop the duplicates in a given year, as the same person's gender would be counted multiple times. But if I don't drop duplicates before running the model, is that an issue when making comparisons between the observed data v. predicted?
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