Tagged Questions
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What might be wrong when my gamm fit is perfectly linear despite my spline term?
I'm using Wood's gamm4 R package and I run:
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4
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Interactions between non-linear predictors
I have data on 70,000 students, nested in 120 schools. I'm starting with fixed effects for the schools, but at some point I might start letting intercepts and slopes vary.
Some key predictors ...
