Apart from a matrix with mean concentrations for each substance and site (= 0 if always below detection limit), matrices with N, standard error, standard deviation, RMSE, as well as measured min and max are calculated. Result is given as a list, of these matrices. Different methods can be chosen: Method 1: arithmetic mean Method 2: functions and RMSE from file, arithmetic mean for substances without functions
annual_mean_conc(x_in, method, data.dir)name of input data.frame
estimation method: 1 = arithmetic mean; 2 = functions and RMSE from file, arithmetic mean for substances without functions
file directory where correlation data and rain series for method 2 are located