Example of Multiply Left-censored Data from Literature

Made up multiply left-censored data. There are 9 observations out of a total of 18 that are reported as <\(DL\), where \(DL\) denotes a detection limit. There are 2 distinct detection limits.

Helsel.Cohn.88.app.b.df

Format

A data frame with 18 observations on the following 3 variables.

Conc.orig

a character vector of original observations

Conc

a numeric vector of observations with censored values coded to censoring levels

Censored

a logical vector indicating which values are censored

Source

Helsel, D.R., and T.A. Cohn. (1988). Estimation of Descriptive Statistics for Multiply Censored Water Quality Data. Water Resources Research 24(12), 1997–2004, Appendix B.