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  3. Analyzing Police Activity with pandas

Exercise

Selecting from a multi-indexed Series

The output of a single .groupby() operation on multiple columns is a Series with a MultiIndex. Working with this type of object is similar to working with a DataFrame:

  • The outer index level is like the DataFrame rows.
  • The inner index level is like the DataFrame columns.

In this exercise, you'll practice accessing data from a multi-indexed Series using the .loc[] accessor.

Instructions

100 XP
  • Save the output of the .groupby() operation from the last exercise as a new object, arrest_rate. (This has been done for you.)
  • Print the arrest_rate Series and examine it.
  • Print the arrest rate for moving violations in bad weather.
  • Print the arrest rates for speeding violations in all three weather conditions.