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Refers to any model where a random variable is related to one or more random variables by a function that is linear in a finite number of parameters.

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Is a tilde or an equals sign correct in linear mixed model formulas?

I know the formula for a linear mixed model (LMM) is often (always?) written with a tilde, rather than an equals sign, between the LHS and RHS. For example, one would write outcome ~ 1 + var1 + (1|var …
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