Hello everyone,

i try to identify the first element of a date vector, for which the following condition holds: at least 3 more dates within the next 365 days, but at least one of these must be between 3-12 month later.

dates = as.Date(sort(rnorm(10,3000,100)), origin = "2000-1-1")

Has anyone an idea how to do this economically? I'll need to apply this to a large dataset with date vectors of various lengths and I can think only of quite difficult algorithms :(

Any ideas would be appreciated,
Felix


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