Copper concentrations in ground water from the Alluvial Fan zone in the San Joaquin Valley of California. One observation was altered to become a <21, larger than all of the detected observations (the largest detected observation is a 20).
Objective is to calculate summary statistics when the largest observation is censored.
There are five detection limits, at 1, 2, 5, 10 and 20 ug/L. An additional artificial detection limit of 21 was added to illustrate a point. Used in Chapter 6 of the NADA book.
data(MDCu)Helsel, Dennis R. (2005). Nondectects and Data Analysis; Statistics for censored environmental data. John Wiley and Sons, USA, NJ.