I spent the last 5 years working as a pollster so I saw a lot of banner books — big hulking books filled with crosstabulations. Crosstabs, for those unfamiliar, display the distributions of survey responses by different groups within your data. I conditioned myself to read and understand crosstabs, that’s now the way I think about data and find patterns in data. As I’ve started doing more work in data science in Python (and Pandas more specifically), one of the first things I figured out was how to recreate crosstabs.
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