search for: simonoff

Is there an R implementation of a scheme for automatic smoothing parameter selection with loess, e.g., by minimizing one of the AIC/GCV statistics discussed by Hurvich, Simonoff & Tsai (1998)? Below is a function that calculates the relevant values of AICC, AICC1 and GCV--- I think, because I to guess from the names of the components returned in a loess object. I guess I could use optimize(), or do a simple line search on span=, but I'm not sure how to use loess....

Dear all, I am interested in correctly testing effects of continuous environmental variables and ordered factors on bacterial abundance. Bacterial abundance is derived from counts and expressed as percentage. My problem is that the abundance data contain many zero values: Bacteria <-

Is there any place where the Chambers and Hastie 1993 Statistical Models in S data sets can be found? Thank you very much. Peter B. -- Peter B. Mandeville mandevip at deimos.tc.uaslp.mx Jefe del Depto. de Inform?tica y Bioestad?stica rpe1531 at pasteur.fmed.uaslp.mx Facultad de Medicine Tel: 48 26-23-45 ext. 232 Universidad Aut?noma de San

...Using Excel for statistical data analysis > >Eva Goldwater, (1999), Univ. of Massachusetts Office of > Information > >Technology > >http://www.umass.edu/acco/statistics/handout/excel.html > > > > > >Statistical analysis using Microsoft Excel > >Jeffrey Simonoff, (2002) > >at > http://www.stern.nyu.edu/~jsimonof/classes/1305/pdf/excelreg. > pdf > > > > > >Testing the Intrinsic Functions of Excel > >National Physical Laboratory, UK > >http://www.npl.co.uk/ssfm/ssfm1/validate/testing/excel.html > > > > &...