EnvStats: Helsel.Hirsch.02.Mayfly.df – R documentation

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Helsel.Hirsch.02.Mayfly.df

Paired Counts of Mayfly Nymphs Above and Below Industrial Outfalls

Description

Counts of mayfly nymphs at low flow in 12 small streams. In each stream, counts were recorded above and below industrial outfalls.

Usage

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. http://water.usgs.gov/pubs/twri/twri4a3/.

EnvStats

Package for Environmental Statistics, Including US EPA Guidance

v2.4.0

GPL (>= 3)

Authors

Steven P. Millard [aut], Alexander Kowarik [ctb, cre] (<https://orcid.org/0000-0001-8598-4130>)

Initial release

2020-10-20