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EnvStats (version 3.0.0)

EPA.92c.arsenic2.df: Arsenic Concentrations from 1992 USEPA Guidance Document

Description

Arsenic concentrations (ppb) at three background wells and one compliance well (six monthly samples for each well; first four missing at compliance well). Nondetects reported as <5.

Usage

EPA.92c.arsenic2.df

Arguments

Format

A data frame with 24 observations on the following 6 variables.

Arsenic.orig

a character vector of original arsenic concentrations (ppb)

Arsenic

a numeric vector of arsenic concentrations with <5 coded as 5

Censored

a logical vector indicating which observations are censored

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)