Manganese concentrations (ppb) at five background wells (five measures at each well).
EPA.09.Ex.15.1.manganese.dfA data frame with 25 observations on the following 5 variables.
Samplea numeric vector indicating the sample number (1-5)
Wella factor indicating the well number
Manganese.Orig.ppba character vector of the original manganese concentrations (ppb)
Manganese.ppba numeric vector of manganese concentrations with non-detects coded to their detecion limit
Censoreda logical vector indicating which observations are censored