Copper and zinc concentrations (mg/L) in shallow ground water from two geological zones (Alluvial Fan and Basin-Trough) in the San Joaquin Valley, CA. There are 68 samples from the Alluvial Fan zone and 50 from the Basin-Trough zone. Some observations are reported as <DL, where DL denotes a detection limit. There are multiple detection limits for both the copper and zinc data in each of the geological zones.
A data frame with 118 observations on the following 8 variables.
a character vector of original copper concentrations (mg/L)
a numeric vector of copper concentrations with nondetects coded to their detection limit
a logical vector indicating which copper concentrations are censored
a character vector of original zinc concentrations (mg/L)
a numeric vector of zinc concentrations with nondetects coded to their detection limit
a logical vector indicating which zinc concentrations are censored
a factor indicating the zone (alluvial fan vs. basin trough)
a numeric vector indicating the sampling location
Millard, S.P., and S.J. Deverel. (1988). Nonparametric Statistical Methods for Comparing Two Sites Based on Data With Multiple Nondetect Limits. Water Resources Research, 24(12), 2087-2098.
Deverel, S.J., R.J. Gilliom, R. Fujii, J.A. Izbicki, and J.C. Fields. (1984). Areal Distribution of Selenium and Other Inorganic Constituents in Shallow Ground Water of the San Luis Drain Service Area, San Joaquin, California: A Preliminary Study. U.S. Geological Survey Water Resources Investigative Report 84-4319.
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