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Mixed (aka multilevel or hierarchical) models are linear models that include both fixed effects and random effects. They are used to model longitudinal or nested data.
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Are random effects just interaction factors with many levels?
Say you're fitting a generalized linear model where the response variable is weight and there are several factors: height, sex, vegetarian, country where the person lives, etc. Now say you expect ther …
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Is it normal to have thousands of df in a logistic regression model?
I'll admit right off the bat that degrees of freedom is not a concept I understand very well in general. That being said, I was reading a study that reported the following results:
I struck me that t …