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Just a simple to check how many times a survey (e.g. diary) was finished. It defaults to checking the "ended" variable for this.
ended(survey, variable = "ended")
which survey are you asking about?
which variable should be filled out, defaults to "ended"
survey <- data.frame(ended = c("2016-05-28 10:11:00", NA, "2016-05-30 11:18:28")) ended(survey = survey)
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