Dear R-Users,
I have a huge data set (172,696 rows) that is set out in the following way:
Area | Length | Species | Method | Date | Events
I want to sum the number of Events if:
Length < 28 AND
Species is NOT "X" ,"Y", or "Z" AND
Method is either "1" ,"2", or "3" AND
Date is between 31/12/08 AND 1/02/09 (i.e. JAN 09)
Is there an easy way to do this?
Your help is much appreciated.
James
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