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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It’s All Greek (or Chinese or Spanish or…) to Me
In English, there’s an idiom that notes confusion: “It’s all Greek to me.” Other languages have similar sayings, but they don’t use Greek as their point of confusion.
What Makes People the Most Happy
It’s in the details of 100,000 moments. I analyzed the crowd-sourced corpus to see what brought the most smiles.
Shift Your Point of View to When America Was “Better”
How good or bad something is depends on what you compare against.