How many surveys were modified?

Just a simple to check how many times a survey (e.g. diary) has expired (i.e. user missed it). It defaults to checking the "expired" variable for this.

modified(survey, variable = "modified")

Arguments

survey	which survey are you asking about?
variable	which variable should be filled out, defaults to "modified"

Examples

survey <- data.frame(modified = c(NA, "2016-05-29 10:11:00", NA))
modified(survey = survey)
#> [1] 1