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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How Different Income Groups Spend Money
After living expenses, where does the money go, and how does it change when you have more cash available?
The Most Gender-Switched Names in US History
We use some names mostly for boys and some mostly for girls, but then there is a small percentage that, over time, switched from one gender to another. Which names made the biggest switch?
How We Spent Our Time in 2020 Versus 2019
Our everyday routines changed over the past year, and with the 2020 American Time Use Survey, we can see by how much.