Hierarchical models, or multilevel models, are used to represent data that might vary on, you guessed, different levels. Michael Freeman, from the University of Washington Information School, provides an introduction to the method using a scrolling format. The transitions give a good sense of how the model can change, depending on your approach.
Visual explainer for hierarchical modeling
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Who Funds the World Health Organization
A couple of weeks ago — or maybe it was a couple of years ago, I’m not sure — the administration announced it would withdraw funding from the World Health Organization. Here’s what that does to the overall picture.