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Interpreting a three-way interaction in a multilevel growth model
Background
I have the following multilevel (mixed effects) growth model:
$$y_{it} =\beta_{0} + \beta_{1}Time_{it} + \beta_{2}Time^2_{it} + \beta_{3}GHP_{i} + \beta_4Baseline_{i} + \beta_5(Time_{it}*...
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