Log-transformed lead concentrations (\(\mu\)g/L) at two background and four compliance wells (four monthly samples for each well).
EPA.89b.loglead.dfA data frame with 24 observations on the following 4 variables.
LogLeadNatural logarithm of lead concentrations (\(\mu\)g/L)
Montha factor indicating the month of collection
Wella factor indicating the well number
Well.typea factor indicating the well type (background vs. compliance)