Generate Walk Bouts from GPS and Accelerometry Data

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Documentation for package ‘walkboutr’ version 0.6.0

• DESCRIPTION file.
• User guides, package vignettes and other documentation.
• Package NEWS.

Help Pages

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_without_metadata	Create the smallest bout window without metadata
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_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