Multilevel Models Part 2: What is a Multilevel Model?

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Multilevel models (also called hierarchical linear models) are used to analyze clustered or grouped data, as well as longitudinal or repeated measures data. Consider the simple scenario shown below, where Y is continuous and is shown as a function of a continuous predictor variable, X (which has been standardized). If […]

This post was kindly contributed by The SAS Training Post - go there to comment and to read the full post.