Computes duration as the difference between the timestamps of active events. To do so, this subsets to active events, computes durations, and handles some edge cases.
calc_time_btw_active_events(dt)Data table of the form produced by parse_paradata.
Data table of active events with two new columns: elapsed_sec and elapsed_min
Determines active event durations by:
Filtering out passive and non-interview events
Computing difference between active events
Passive events include:
Events of the following types in event: c("ApproveByHeadquarter", "ApproveBySupervisor", "ClosedBySupervisor", "KeyAssigned", "OpenedBySupervisor", "QuestionDeclaredInvalid", "QuestionDeclaredValid", "ReceivedByInterviewer", "ReceivedBySupervisor", "RejectedByHeadquarter", "RejectedBySupervisor", "SupervisorAssigned", "TranslationSwitched", "UnapproveByHeadquarters", "VariableDisabled", "VariableSet")
Pauses in the interview--that is, time between Pause and Resume events
End and resumption of the interview--that is between events and Restarted or between Restarted and an event
All other events are considered active