Counts of mayfly nymphs at low flow in 12 small streams. In each stream, counts were recorded above and below industrial outfalls.
data(Helsel.Hirsch.02.Mayfly.df)A data frame with 24 observations on the following 3 variables.
Mayfly.CountNumber of mayfly nymphs counted
Streama factor indicating the stream number
Locationa factor indicating the location of the count (above vs. below)