Displaying 2 results from an estimated 2 matches for "solea".
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sole
2012 May 19
4
weighted averages for two variables
Hi R users,
I have a dataset with multiple variables and i'm trying to weigh average
depths for fish species per year by their abundance (CPUE. I have tried the
weighted.mean function but as i have two columns for the x value the lenghts
differ with the w (CPUE). How do I solve this problem?
So far I have tried this:
data<-by(allspecies, list(allspecies$Depth, allspecies$Year),
2008 Apr 07
2
Matching pairs from two data frame
I am looking for a solution to match 2 dataframes from pairs of values (x and
y) as indicated thereafter :
First dataframe :
DATA1
x y a
1 30 40 0.2
2 21 130 0.3
Second dataframe
DATA2
x y b
1 30 40 1
2 40 30 3
3 20 40 7
4 11 30 2
5 130 250 15
6 21 130 17
expected Results :
DATA3
x y a b
1 30 40 0.2 1
2