down_distance_updater   Update the down and distance of a drive
expected_pts_fourth     Decision for 4th downs based on expected points
prep_pbp_data           Add necessary columns to nflscrapR data
sample_drives           Sample a Series of Drives, a strategy to test
                        verses the normal strategy
sample_fourth_down_strategy
                        Sample NFL play-by-play data with a specified
                        4th down strategy
sample_passes_rushes_strategy
                        Sample NFL play-by-play data with a specified
                        blend of rushing and passing
sample_play             Sample one NFL play according to some strategy
