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2017 Sep 15
1
Calculating Weeks Since Last Event
...Moving to
'2015-03-09' there was a promotion the week before and so 1 week elapsed
after the last promo.
If we look at '2015-06-15' then there was a promo 4 weeks back in the week
of '2015-05-18' and so 'Weeks_Since_Last_Promo' = 4.
How can we do it in R?
Thanks,
Abhinaba
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