On Wed, 1 Aug 2007, Marco Helbich wrote: > Dear list, > > I've got two autocorrelated datasets and want to perform a two-sample t-test > comparing the means. Because of the autocorrelation the t-test assumtions > are violated. In Cliff & Ord (1981, Spatial Processes, Ch. 7.2) I read that > there is an alternative modified t-test, which considers autocorrelation. Is > such a test implemented in R or somewhere else? Can anybody give me a > helping hand?
The test isn't implemented as far as I know, but it shouldn't be too difficult to try, all of the bits to do the first kind (7.4, 7.8, 7.9) are present. What is really needed is a reproducible example so that an implementation in R could be checked. I'll see if I still have a copy of the 1975 paper somewhere, full-text is not (yet) available for Environment & Planning. Hope this helps, Roger > > I appreciate every hint! Thanks. > Marco > __________________ > > Marco Helbich > ISR > Postgasse 7/4/2 > A-1010, Vienna > > _______________________________________________ > R-sig-Geo mailing list > R-sig-Geo@stat.math.ethz.ch > https://stat.ethz.ch/mailman/listinfo/r-sig-geo > -- Roger Bivand Economic Geography Section, Department of Economics, Norwegian School of Economics and Business Administration, Helleveien 30, N-5045 Bergen, Norway. voice: +47 55 95 93 55; fax +47 55 95 95 43 e-mail: [EMAIL PROTECTED] _______________________________________________ R-sig-Geo mailing list R-sig-Geo@stat.math.ethz.ch https://stat.ethz.ch/mailman/listinfo/r-sig-geo