Sulfate concentrations (mg/L). Nondetects reported as <1450.
data(EPA.89b.sulfate.df)A data frame with 24 observations on the following 3 variables.
Sulfate.origa character vector of original sulfate concentration (mg/L)
Sulfatea numeric vector of sulfate concentations with <1450 coded as 1450
Censoreda logical vector indicating which observations are censored