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retain
2012 Jan 30
1
how to sum multiple data entries for the same sampling event?
I'm having trouble with some catch per unit effort data (CPUE, fisheries
data). Some of the samples were "retained" and some "unretained," and they
are entered as 2 separate entries for the same sampling event (Date and
time). I want to calculate the total CPUE (so sum the "retained" and
"unretained" number for each sampling event) and am having troubld doing so.
Here's a sample of what my data.frame l...