Sachin, One of the references in the link is a EPA groundwater statistics training manual from the early nineties. For a more complete related discussion see pp. 50-62 of the July 1992 EPA draft addendum on groundwater monitoring statistics at
http://www.epa.gov/correctiveaction/resource/guidance/sitechar/gwstats/gwstats.htm Regarding discussion the prediction interval for linear regression you might want to read sections of chapter 9 in Helsel and Hirsch: http://pubs.usgs.gov/twri/twri4a3/ I would also recommend working of the examples in these or other references with R in order to 1.) reassure yourself that the code is doing what you want and 2.) you are comfortable with the concepts. I seem to recall seeing the terms 'tolerance interval' and 'prediction interval' mingled in some discussions--shades of Peter's 'hardly universal' comment. This means that there is even more incentive to develop some facility with the concept and code by working a few out first. HTH Regards, Michael Grant --- Peter Dalgaard <[EMAIL PROTECTED]> wrote: > Sachin J <[EMAIL PROTECTED]> writes: > > > Google search gave me this: > > > > > http://ewr.cee.vt.edu/environmental/teach/smprimer/intervals/interval.html > > > > TIA > > Sachin > > With those definitions (which are hardly universal), tolerance > intervals are the same as prediction intervals with k == m == 1, which > is what R provides. > > > > > > Peter Dalgaard <[EMAIL PROTECTED]> wrote: > > Sachin J writes: > > > > > RUsers: > > > > > > Just confirming, does predict function with interval="prediction" > > > option gives prediction interval or tolerance interval?. Sorry for > > > reposting this question. > > > > > > Is there any definition of tolerance interval that is different from > > prediction interval? > > > > (Tolerance intervals in the medical sense means intervals that are > > designed to detect patients with abnormal levels of serum cholesterol > > (say).) > > > > -- > > O__ ---- Peter Dalgaard Øster Farimagsgade 5, Entr.B > > c/ /'_ --- Dept. of Biostatistics PO Box 2099, 1014 Cph. K > > (*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918 > > ~~~~~~~~~~ - ([EMAIL PROTECTED]) FAX: (+45) 35327907 > > > > > > > > --------------------------------- > > Do you Yahoo!? > > -- > O__ ---- Peter Dalgaard Øster Farimagsgade 5, Entr.B > c/ /'_ --- Dept. of Biostatistics PO Box 2099, 1014 Cph. K > (*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918 > ~~~~~~~~~~ - ([EMAIL PROTECTED]) FAX: (+45) 35327907 > > ______________________________________________ > [email protected] 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. > ______________________________________________ [email protected] 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.
