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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Looking For the Closest Casino
Casinos are everywhere. This interactive map tells you how close the nearest one is in sampled areas of the United States.
Years You Have Left to Live, Probably
The individual data points of life are much less predictable than the average. Here’s a simulation that shows you how much time is left on the clock.
Americans are Growing Bigger
We keep getting bigger. Watch overweight and obesity rates move up over several decades.