Tetrachloroethylene (PCE) concentrations (ppb) at one background well and one compliance well.
EPA.09.Ex.16.5.PCE.dfA data frame with 14 observations on the following 4 variables.
Well.typea factor with levels Background Compliance
PCE.Orig.ppba character vector of original PCE concentrations (ppb)
PCE.ppba numeric vector of PCE concentrations (ppb) with nondetects set to their detection limit
Censoreda logical vector indicating which observations are censored