The same atrazine concentrations as in Atra, stacked into one column (col.1). Column 2 indicates the month of collection. Column 3 indicates which data are below the detection limit those with a value of 1.
Objective is to determine if concentrations increase from June to September. There is one detection limit, at 0.01 ug/L. Used in Chapter 9 of the NADA book.
data(Atrazine)Helsel, Dennis R. (2005). Nondectects and Data Analysis; Statistics for censored environmental data. John Wiley and Sons, USA, NJ.