EnvStats (version 2.4.0)

EPA.09.Ex.17.4.copper.df: Copper Concentrations from Example 17-4 of 2009 USEPA Guidance Document

Description

Copper concentrations (ppb) at three background and two compliance wells (eight monthly measures at the background wells, four monthly measures at the compliance wells).

Usage

EPA.09.Ex.17.4.copper.df

Arguments

Format

A data frame with 40 observations on the following 6 variables.

Month

a factor indicating the month of collection

Well

a factor indicating the well number

Well.type

a factor indicating the well type (background vs. compliance)

Copper.ppb.orig

a character vector of original copper concentrations (ppb)

Copper.ppb

a numeric vector of copper concentrations with nondetects set to their detection limit

Censored

a logical vector indicating which observations are censored