Thank you. So that means that e.g. with ordinary cokriging, the one condition "sum of all coefficients equal 1" is used, and not e.g. the (n+1) nonbias conditions by which the coefficients of the target variable sum to 1, whereas the coefficients of the n secondary variables sum to 0 ? I'm sorry, I'm not aware of what the "usual ones" are unluckily. :)
Regards. On 6 April 2011 13:02, Edzer Pebesma <edzer.pebe...@uni-muenster.de> wrote: > > > On 04/06/2011 11:43 AM, piero campa wrote: > > Dear list and dear Edzer, > > I was wondering which unbiasedness condition(s) is/are used in the > > predict.gstat function when cokriging methods are called. > > The usual ones; if no trend function is specified (...~1), then an > unbiasedness condition for the mean value is used; if some trend > function is specified the conditions extend to the mean parameters. > > Function gstat() has a merge parameter that allows one to join the > unbiasedness condition for any two parameters to one. > > > > Thank you in advance. > > /Piero > > > > -- > > View this message in context: > http://r-sig-geo.2731867.n2.nabble.com/Cokriging-unbiasedness-condition-tp6245350p6245350.html > > Sent from the R-sig-geo mailing list archive at Nabble.com. > > > > _______________________________________________ > > R-sig-Geo mailing list > > R-sig-Geo@r-project.org > > https://stat.ethz.ch/mailman/listinfo/r-sig-geo > > -- > Edzer Pebesma > Institute for Geoinformatics (ifgi), University of Münster > Weseler Straße 253, 48151 Münster, Germany. Phone: +49 251 > 8333081, Fax: +49 251 8339763 http://ifgi.uni-muenster.de > http://www.52north.org/geostatistics e.pebe...@wwu.de > > _______________________________________________ > R-sig-Geo mailing list > R-sig-Geo@r-project.org > https://stat.ethz.ch/mailman/listinfo/r-sig-geo > [[alternative HTML version deleted]]
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