| EPA.92c.arsenic2.df | R Documentation | 
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. 
EPA.92c.arsenic2.dfA data frame with 24 observations on the following 6 variables.
Arsenic.origa character vector of original arsenic concentrations (ppb)
Arsenica numeric vector of arsenic concentrations with <5 coded as 5
Censoreda logical vector indicating which observations are censored
Montha factor indicating the month of collection
Wella factor indicating the well number
Well.typea factor indicating the well type (background vs. compliance)
USEPA. (1992c). Statistical Analysis of Ground-Water Monitoring Data at RCRA Facilities: Addendum to Interim Final Guidance. Office of Solid Waste, U.S. Environmental Protection Agency, Washington, D.C. p.60.
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