Arsenic concentrations (\(\mu\)g/L) at a single well, consisting of: 8 historical observations, 4 future observations for Case 1, and 4 future observations for Case 2.
EPA.09.Ex.7.1.arsenic.dfA data frame with 16 observations on the following 2 variables.
Data.Sourcea factor with levels Historical, Case.1, Case.2
Arsenic.ug.per.la numeric vector of arsenic concentrations (\(\mu\)g/L)