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2011 Oct 24
2
How to selectively sum rows [Beginner question]
Hi, I am new to R so I would appreciate any help. I have some data that has
passenger flight data between city pairs. The way I got the data, there are
multiple rows of data for each city pair; the number of passengers needs to
be summed to get a TOTAL annual passenger count for each city pair.
So my question is: how do I create a new table (or data frame) that
selectively sums
My initial