Benzene concentrations (ppm) at one background and five compliance wells (four monthly samples for each well).
EPA.89b.benzene.df
A data frame with 24 observations on the following 6 variables.
Benzene.orig
a character vector of the original observations
Benzene
a numeric vector with <1
observations coded as 1
Censored
a logical vector indicating which observations are censored
Month
a factor indicating the month of collection
Well
a factor indicating the well number
Well.type
a factor indicating the well type (background vs. compliance)