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EPA.09.Ex.18.4.xylene.df: Xylene Concentrations from Example 18-4 of 2009 USEPA Guidance Document

Description

Xylene concentrations (ppb) at three background wells and one compliance well. Eight monthly measures at each complaince well; three monthly measures at the compliance well.

Usage

EPA.09.Ex.18.4.xylene.df

Arguments

Format

A data frame with 32 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)

Xylene.ppb.orig

a character vector of original xylene concentrations (ppb)

Xylene.ppb

a numeric vector of xylene concentrations (ppb) with nondetects set to their detection limit

Censored

a logical vector indicating which observations are censored