Check if the specified activity is present (contained) in a case for exactly
contains_exactly rule examines whether the supplied
activity is present in a case for an exact number of
contains_exactly(activity, n = 1)
Other Cardinality rules:
library(bupaR) library(eventdataR) # Each patient should have exactly one registration activity instance. patients %>% check_rule(contains_exactly("Registration", n = 1))
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