[R] weighted averages for two variables

mpostje mayo_jojo at hotmail.com
Sat May 19 16:52:42 CEST 2012


This is the output that i got

> dput( head(allspecies, 20) ) 
structure(list(Year = c(1980L, 1980L, 1980L, 1980L, 1980L, 1980L, 
1980L, 1980L, 1980L, 1980L, 1980L, 1980L, 1981L, 1981L, 1981L, 
1981L, 1981L, 1981L, 1981L, 1981L), Quarter = c(1L, 1L, 1L, 1L, 
1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L
), latitude = c(54.9, 54.4833, 54.4833, 53.9167, 53.9167, 54.7833, 
58.8667, 58.25, 58.25, 57.9, 57.9, 57.9667, 56.5333, 56.5333, 
56.5333, 56.5333, 54.7167, 54.7167, 54.7167, 54.45), longitude = c(6.1333, 
7.55, 7.55, 0.9, 0.9, 1.0333, -2.3833, -3.15, -3.15, -3.3667, 
-3.3667, -2.8333, -2.2, -2.2, -2.2, -2.2, 7.3333, 7.3333, 7.3333, 
7.55), Depth = c(33, 24, 24, 49, 49, 55, 76, 69, 69, 57, 57, 
73, 46, 46, 46, 46, 20, 20, 20, 20), Area = c(6L, 6L, 6L, 4L, 
4L, 4L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 6L, 6L, 6L, 6L
), Species = structure(c(1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 
1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L), .Label = c("Agonus
cataphractus", 
"Amblyraja radiata", "Anarhichas lupus", "Arnoglossus laterna", 
"Buglossidium luteum", "Echiichthys vipera", "Eutrigla gurnardus", 
"Gadus morhua", "Glyptocephalus cynoglossus", "Hippoglossoides
platessoides", 
"Lepidorhombus whiffiagonis", "Limanda limanda", "Lophius piscatorius", 
"Melanogrammus aeglefinus", "Merlangius merlangus", "Merluccius merluccius", 
"Microstomus kitt", "Molva molva", "Pleuronectes platessa", "Pollachius
virens", 
"Scyliorhinus canicula", "Solea solea", "Squalus acanthias", 
"Trisopterus esmarkii", "Trisopterus luscus", "Trisopterus minutus"
), class = "factor"), CPUE = c(1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 
1, 1, 1, 1, 1, 1, 1, 1, 1, 1)), .Names = c("Year", "Quarter", 
"latitude", "longitude", "Depth", "Area", "Species", "CPUE"), row.names =
15:34, class = "data.frame")



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