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EnvStats (version 3.0.0)

Helsel.Cohn.88.silver.df: Silver Concentrations From An Interlab Comparison

Description

Silver concentrations (mg/L) from an interlab comparison. There are 34 observations out of a total of 56 that are reported as <DL, where DL denotes a detection limit. There are 12 distinct detection limits.

Usage

Helsel.Cohn.88.silver.df

Arguments

Format

A data frame with 56 observations on the following 4 variables.

Ag.orig

a character vector of original silver concentrations (mg/L)

Ag

a numeric vector with nondetects coded to the detection limit

Censored

a logical vector indicating which observations are censored

log.Ag

the natural logarithm of Ag

References

Janzer, V.J. (1986). Report of the U.S. Geological Survey's Analytical Evaluation Program--Standard Reference Water Samples M6, M94, T95, N16, P8, and SED3. Technical Report, Branch of Quality Assurance, U.S. Geological Survey, Arvada, CO.