add_date_and_format     Add date and format to activity counts
assign_epoch_start_time
                        Assign Epoch Start Time
collate_arguments       Collate Arguments This function collates
                        user-provided arguments with pre-defined
                        parameters and constants.
constants               List of Constants
                        'non_wearing_min_threshold_epochs' Number of
                        consecutive epochs with activity counts of 0
                        that constitute a non_wearing period.
                        'min_wearing_hours_per_day' Minimum number of
                        hours in a day an individual must wear an
                        accelerometer for the day to be considered
                        complete. 'min_gps_obs_within_bout' Minimum
                        number of GPS observations within a bout for
                        that bout to be considered to have complete GPS
                        data. 'min_gps_coverage_ratio' Minimum ratio of
                        data points with versus without GPS data for
                        the bout to be considered to have complete GPS
                        data. 'dwellbout_radii_quantile' Threshold for
                        outliering GPS data points - any data points
                        above the 95th percentile are outliered.
                        'max_dwellbout_radii_ft' Maximum radius, in
                        feet, of a bounding circle that would be
                        considered a dwell bout (rather than a
                        potential walk bout). 'min_dwellbout_obs'
                        Minimum number of observations to consider
                        something a potential dwell bout.
                        'max_walking_cpe' Maxiumum CPE value before the
                        accelerometer is considered to be picking up on
                        an activity other than walking.
                        'min_walking_speed_km_h' Minimum speed
                        considered walking. 'max_walking_speed_km_h'
                        Maximum speed considered walking.
evaluate_gps_completeness
                        Evaluate GPS completeness for each walking bout
generate_bout_category
                        Generate bout categories
generate_bout_plot      Generate Bout Plot
generate_bout_radius    Generate Bounding Circle Radius for Walking
                        Bouts
generate_gps_data       Generate a dataset with date-time, speed, and
                        latitude and longitude of someone moving
                        through space on a walk in Seattle
generate_walking_in_seattle_gps_data
                        Generate GPS data for a walking activity in
                        Seattle, WA
identify_bouts          Identify Bouts:
identify_complete_days
                        Identify complete wearing days This function
                        identifies complete days based on accelerometry
                        data by calculating the total number of epochs
                        worn per day and comparing it to the minimum
                        number of wearing epochs per day required to
                        consider a day complete.
identify_non_wearing_periods
                        Identify non-wearing periods: This function
                        identifies non-wearing periods in accelerometry
                        data based on a threshold of consecutive epochs
                        with activity counts of 0.
identify_walk_bouts_in_gps_and_accelerometry_data
                        Identify walking bouts in GPS and accelerometry
                        data:
make_active_period      Generate accelerometry datasets
make_full_day_bout      Create activity counts for a full day bout
make_full_day_bout_without_metadata
                        Create activity counts for a full day bout
                        without metadata
make_full_walk_bout_df
                        Create a data frame of walking bouts with GPS
                        data
make_inactive_period    Create an inactive period
make_non_bout_window    Create a non-bout window
make_smallest_bout      Make the smallest bout dataset
make_smallest_bout_window
                        Create the smallest bout window
make_smallest_bout_with_largest_inactive_period
                        Generate a sequence of accelerometer counts
                        representing the smallest bout with the largest
                        inactive period
make_smallest_bout_with_smallest_non_wearing_period
                        Generate the smallest bout with the smallest
                        non-wearing period dataset
make_smallest_bout_without_metadata
                        Create the smallest bout window without
                        metadata
make_smallest_complete_day_activity
                        Generate an activity sequence for a complete
                        day with minimal activity
make_smallest_nonwearing_window
                        Create smallest non-wearing window
next_lat_long           Calculate next latitude and longitude based on
                        current location, speed, direction, and time
                        elapsed.
outlier_gps_points      Outlier GPS data points This function
                        identifies outlier GPS points for the bout
                        radius calculation from a given set of latitude
                        and longitude coordinates.
parameters              Global parameters and constants
process_accelerometry_counts_into_bouts
                        Process Accelerometry Counts into Bouts
process_bouts_and_gps_epochs_into_walkbouts
                        Process bouts and GPS epochs into walk bouts
process_gps_data_into_gps_epochs
                        Convert GPS data into GPS epochs
run_length_encode       Run Length Encoding:
summarize_walk_bouts    Summarize walking bouts: This function
                        summarizes walking bouts and calculates the
                        median speed, complete day, non-wearing, bout
                        start, and duration of each bout.
validate_accelerometry_data
                        Validate accelerometry input data
validate_gps_data       Validate GPS data
