Beyond known limits are left/right censored data. You need to use statistical methodology that handles censoring. See the survival package and the CRAN Survival task view for this -- or consult an appropriate expert. There are of course standard ways of annotating such data in these packages.
Bert On Mon, Dec 20, 2021, 8:41 PM Marc Girondot via R-help <r-help@r-project.org> wrote: > Dear members, > > I work about dosage and some values are bellow the detection limit. I > would like create new "numbers" like LDL (to represent lower than > detection limit) and UDL (upper the detection limit) that behave like > NA, with the possibility to test them using for example is.LDL() or > is.UDL(). > > Note that NA is not the same than LDL or UDL: NA represent missing data. > Here the data is available as LDL or UDL. > > NA is built in R language very deep... any option to create new version > of NA-equivalent ? > > Thanks > > Marc > > ______________________________________________ > R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide > http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. > [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
