Log-transformed lead concentrations (ppb) at two background and four compliance wells (four quarterly measures at each well).
EPA.09.Ex.17.1.loglead.df
A data frame with 24 observations on the following 4 variables.
Month
a factor indicating the month of collection; 1
= Jan, 2
= Apr, 3
= Jul, 4
= Oct
Well
a factor indicating the well number
Well.type
a factor indicating the well type (background vs. compliance)
LogLead
a numeric vector of log-transformed lead concentrations (ppb)