Lead concentration in soil samples.

Lead (Pb) concentrations (mg/kg) in 29 discrete environmental soil samples from a site suspected to be contaminated with lead.

Beal.2010.Pb.df
    data(Beal.2010.Pb.df)

Format

A data frame with 29 observations on the following 3 variables.

Pb.char

Character vector indicating lead concentrations. Nondetects indicated with the less-than sign (e.g., <1)

Pb

numeric vector indicating lead concentration.

Censored

logical vector indicating censoring status.

Source

Beal, D. (2010). A Macro for Calculating Summary Statistics on Left Censored Environmental Data Using the Kaplan-Meier Method. Paper SDA-09, presented at Southeast SAS Users Group 2010, September 26-28, Savannah, GA. https://analytics.ncsu.edu/sesug/2010/SDA09.Beal.pdf.