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trouble
2012 Jan 30
1
how to sum multiple data entries for the same sampling event?
...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 looks like now:
Date lmb.cpue
Disposition.of.Catch
1999-07-10 12:10:00 0.66666667 Unretained
1999-07-10 12:10:00 0.16666667 Retained
1999-07-14 11:22:00 0.83333333...