Numerical Computing with Python

How it works...

This recipe takes a look at the total population of all the institutions on a state-by-state basis. The goal is to keep all the rows from the states, as a whole, that have a minority majority. This requires us to group our data by state, which is done in step 1. We find that there are 59 independent groups.

The filter groupby method either keeps all the rows in a group or filters them out. It does not change the number of columns. The filter groupby method performs this gatekeeping through a user-defined function, for example, check_minority in this recipe. A very important aspect to filter is that it passes the entire DataFrame for that particular group to the user-defined function and returns a single boolean for each group. ...