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..."var2")]) # Compute the statistic (i.e. sum of mean squared differences) return(sum(meanSqDiff)) } # Get data online : http://dl.getdropbox.com/u/1047321/syrjala_data_cod.csv system("curl http://dl.getdropbox.com/u/1047321/syrjala_data_cod.csv > syrjala_data_cod.csv") dataCod = read.csv(file = "syrjala_data_cod.csv", header = TRUE) # Normalize abundances dataCod$var1 = dataCod$var1/sum(dataCod$var1) dataCod$var2 = dataCod$var2/sum(dataCod$var2) # Number of permutations nperm = 1000 # Create nperm-1 replicates of the data (one is the original observation)...