In the Bayesian paradigm, I have found examples of models that could be called any of the following:

  • random-effects models
  • multilevel models
  • hierarchical models.

Each of these categories even has its own tag on this site!

So what are the important differences, then? How much of this is just rewording?


When most people use these terms they are using them interchangeably to mean the same thing, although, I suppose technically a random-effects model (more commonly a mixed-effects model) is one of a several ways that you could model hierarchical or multi-level data. As their names imply multi-level models and hierarchical models are those that typically represent a modeling of some hierarchical structure or multiple levels of nested data. For example, a student in a classroom, within a school, within a school district, within a state. Each level of nesting typically has a random component associated with it. Since different groups and the members of the groups tend to influence (and be influenced by) group membership, these data structures makes them ideally suited for random-effects modelling.

You'll find a good discussion on the history and naming of these models in the introduction (pages 5-15) of Hierarchical Linear Models: Applications and Data Analysis Methods, 2d. by Stephen Raudenbush and Anthony S. Bryk.

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