[R] Creating NA equivalent

Bert Gunter bgunter@4567 @end|ng |rom gm@||@com
Tue Dec 21 06:12:02 CET 2021

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


On Mon, Dec 20, 2021, 8:41 PM Marc Girondot via R-help <r-help using r-project.org>

> 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
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