On Mon, 13 Aug 2012, Bert Gunter wrote:

The proper approach is to use the proper approach: model it as
left-censored data. The problem with that is:

I'm trying to impute data below detection limit (with multiple detection
limits) so i need just a method or a code for imputation and then
extract the complete dataset to do the analyses. Is there any package
which could do that simply as i'm a beginner in R

  This is the purpose of the NADA package. The package is based on Dennis
Helsel's "Statistics for Censored Environmental Data Using Minitab and R,
Second Edition."

Rich

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