As {NADA}

Dissolved arsenic concentrations in ground water of U.S.

Description

This dataset is a random selection of dissolved arsenic analyses taken during the U.S. Geological Survey's National Water Quality Assessment program (NAWQA).

Usage

    data(NADA.As)

Format

A list containing 50 observations with items ‘obs’ and ‘censored’. ‘obs’ is a numeric vector of all arsenic observations (both censored and uncensored). ‘censored’ is a logical vector indicating where an element of ‘obs’ is censored (a less-than value).

Source

U.S. Geological Survey National Water Quality Assessment Data Warehouse

References

The USGS NAWQA site at http://water.usgs.gov/nawqa