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.
Data Underload #3 – The Resolution Cycle
Late at night, the new year’s resolution longed for a straight line.
What Qualifies as Middle-Income in Each State
The meaning of “middle-income” changes a lot depending on where you live and your household size.