Monthly unadjusted and adjusted analyte concentrations over a 3-year period. Adjusted concentrations are computed by subtracting the monthly mean and adding the overall mean.
EPA.09.Ex.14.8.dfA data frame with 36 observations on the following 4 variables.
Montha factor indicating the month of collection
Yeara numeric vector indicating the year of collection
Unadj.Conca numeric vector of unadjusted concentrations
Adj.Conca numeric vector adjusted concentrations