Alternative Atrazine concentrations altered from the Atra data set so that there are more nondetects, adding a second detection limit at 0.05.
Objective is to determine if concentrations increase from June to September. There are two detection limits, at 0.01 and 0.05 ug/L. Used in Chapters 5 and 9 of the NADA book.
data(AtraAlt)Helsel, Dennis R. (2005). Nondectects and Data Analysis; Statistics for censored environmental data. John Wiley and Sons, USA, NJ.