The 'absent' rule can be used to check whether an activity is absent in a case or not. The 'n' parameter can be configured to create a different level of _absence_. When n = 1, an activity is not allowed to occur even a single time. The maximum number of times it is allowed to occur is 'n-1'.
absent(activity, n = 0)
The activity to check. Character vector of length one.
n is the allowed number of occurences of the activity. E.g. n = 0 means the activity should be absent, n = 1 means it is allowed to occur once.
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library(bupaR) library(eventdataR) # Check for which patients the activity "MRI SCAN" is absent. patients %>% check_rule(absent("MRI SCAN")) # Check for which patients the activity "Blood test" # occurs maximum a single time, but not 2 times or more. patients %>% check_rule(absent("Blood test", n = 1))
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