Calculating Boolean statistics

It can be informative to calculate basic summary statistics on Boolean arrays. Each value of a Boolean array, the True or False, evaluates to 1 or 0 respectively, so all the Series methods that work with numerical values also work with Booleans.

In this recipe, we create a Boolean array by applying a condition to a column of data and then calculate summary statistics from it.

How to do it…

1. Read in the movie dataset, set the index to the movie title, and inspect the first few rows of the duration column:

   >>> import pandas as pd
   >>> import numpy as np
   >>> movie = pd.read_csv(
   ...     "data/movie.csv", index_col="movie_title"
   ... )
   >>> movie[["duration"]].head()
                                               Duration
   movie_title
   Avatar                                         178.0
   Pirates of the Caribbean: At World's End       169.0
   Spectre       ...