Description

Artificial 1,2,3,4-Tetrachlorobenzene (TcCB) concentrations with censored values; based on the reference area data stored in EPA.94b.tccb.df. The data frame EPA.94b.tccb.df contains TcCB concentrations (ppb) in soil samples at a reference area and a cleanup area. The data frame
Modified.TcCB.df contains a modified version of the data from the reference area. For this data set, the concentrations of TcCB less than 0.5 ppb have been recoded as <0.5.

Usage

Format

A data frame with 47 observations on the following 3 variables.

TcCB.orig

a character vector of original TcCB concentrations (ppb)

TcCB

a numeric vector with censored observations set to their detection level

Censored

a logical vector indicating which observations are censored

Source

Millard, S.P., and N.K. Neerchal. (2001). Environmental Statistics with S-PLUS. CRC Press, Boca Raton, FL, p.595.

References

USEPA. (1994b). Statistical Methods for Evaluating the Attainment of Cleanup Standards, Volume 3: Reference-Based Standards for Soils and Solid Media. EPA/230-R-94-004. Office of Policy, Planning, and Evaluation, U.S. Environmental Protection Agency, Washington, D.C.

See Also

EPA.94b.tccb.df.