Hello all!
I have a data frame with nine variables and 293 cases. (attached goes
the csv file).
I need to calculate a index using the sum of one variable (N) divided
by the length of other variable (Fisherman), but for each day (Date).
I tried to use that codes:
by (cpue, cpue$Date, function (x) sum (cpue$N)/length(cpue$Fisherman))
tapply (cpue$Data, cpue$Data, function (x) {sum (x)/length(y)})
In both codes, as result, I received the same value for all Date
value. And, oddly, this result is the value of calculation for all
data frame, as I used just:
sum (cpue$N)/length(cpue$Fishermans)
Sorry for the basic question, but I worked on this simple code all day
and can't do it work out! And have no idea why...
I'm using R 2.11 in Windows XP.
Since now, thanks for the attention and all help,
Best,
Raoni
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