To further what Bert says: You would almost certainly prefer to use robust statistics than "outlier detection".
I believe Greg Snow's TeachingDemos package has a data set "outliers" suggesting some of the perils of doing things the outlier-removal way. Best, Michael On Wed, Jul 18, 2012 at 9:14 AM, Bert Gunter <gunter.ber...@gene.com> wrote: > checkforoutliers <- function(series)NULL > > Cheers, > Bert > > *Explanation: There is no such thing as a statistical outlier -- or, > rather,"outlier" is a fraudulent statistical concept, defined arbitrarily > and without scientific legitimacy. The typical unstated purpose of such > identification is to remove contaminating or irrelevant data, but such a > judgment can only be made by a subject matter expert with knowledge of the > context and, usually, the specific cause for the unusual data. Do not be > misled by the large body of statistical literature on this topic into > believing that statistical analysis alone can provide objective criteria to > do this. That is a path to scientific purgatory. > > For the record: > 1. I am a statistician > 2. Lots of highly knowledgeable, smart statisticians will condemn what I > have just said as stupid ranting. > > The perils of a mailing list. > > -- Bert > > On Wed, Jul 18, 2012 at 6:27 AM, Sajeeka Nanayakkara > <nsaje...@yahoo.com>wrote: > >> >> >> >> >> What is the R code to check whether data series have outliers or not? >> >> Thanks, >> >> Sajeeka Nanayakkara >> [[alternative HTML version deleted]] >> >> >> ______________________________________________ >> R-help@r-project.org mailing list >> 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. >> >> > > > -- > > Bert Gunter > Genentech Nonclinical Biostatistics > > Internal Contact Info: > Phone: 467-7374 > Website: > http://pharmadevelopment.roche.com/index/pdb/pdb-functional-groups/pdb-biostatistics/pdb-ncb-home.htm > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help@r-project.org mailing list > 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. ______________________________________________ R-help@r-project.org mailing list 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.