Paired Counts of Mayfly Nymphs Above and Below Industrial Outfalls

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)

Format

A data frame with 24 observations on the following 3 variables.

Mayfly.Count

Number of mayfly nymphs counted

Stream

a factor indicating the stream number

Location

a factor indicating the location of the count (above vs. below)

Source

Helsel, D.R., and R.M. Hirsch. (2002). Statistical Methods in Water Resources Research. Techniques of Water Resources Investigations, Book 4, Chapter A3. U.S. Geological Survey, 139–140. https://pubs.usgs.gov/tm/04/a03/tm4a3.pdf.