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walkboutr comes with several preset parameters. The parameters that we are using are:

  • Epoch length epoch_length = 30 Epoch length is the length of an epoch in seconds.
  • CPE associated with being active active_counts_per_epoch_min = 500 The number of CPE associated with being active are the accelerometry counts, in CPE, that are considered to reflect someone who is active (compared to inactive or at a very low activity level)
  • Minimum bout length minimum_bout_length = 10 The minimum bout length is in epochs and is the minimum amount of time that must elapse for something to be considered a bout. A minimum bout length is equal to a minimum bout length of 5 minutes.
  • Local time zone local_time_zone = "America/Los_Angeles" For the purposes of evaluating whether we have a complete day of data (a flag that is passed as an output of this package), we use the local time zone of your data.
  • Maximum number of consecutive inactive epochs in a bout maximum_number_consec_inactive_epochs_in_bout = 3 A bout of walking, or activity, is allowed to have up to a certain number of consecutive epochs of inactivity (or low activity) before the bout would terminate. The standard amount of inactive time that can interrupt a bout is 2 minutes, and thus the maximum number of consecutive inactive epochs in a bout is 3, or 1.5 minutes. After that, we would hit the 2 minute threshold and the bout would end rather than be interrupted.

If you want to set any of these parameters yourself, you can simply pass them into the functions. If you pass nothing, the above default parameter values will be used.

For example, if we generate some sample data, we can then pass in a different parameter value.

Now that we have sample data, we can look at how walkboutr generates bouts:

walk_bouts <- identify_walk_bouts_in_gps_and_accelerometry_data(gps_data, accelerometry_counts, epoch_length = 15)
summary_walk_bouts <- summarize_walk_bouts(walk_bouts)

This will change the way we treat epochs to regard them as 15 second intervals rather than 30 second intervals. The same can be done with any parameters listed above.