On 10/26/2010 09:02 AM, eric.ja...@ujf-grenoble.fr wrote: > Hello, > > I would like to know if there is a way to get the trend coefficents when > doing kriging with external drift. I would like to compare with the > coefficients that I can have when doing temperature = f(altitude) for a > sample of stations. > Thanks for your answer(s). > > Eric > > _______________________________________________ > R-sig-Geo mailing list > R-sig-Geo@stat.math.ethz.ch > https://stat.ethz.ch/mailman/listinfo/r-sig-geo
Eric, try library(gstat) demo(blue) shows you one way how to do this. It is a bit tricky, because you're using prediction equations (that disregard the residual, if BLUE=TRUE) to get them. But then, in the end if your regression model is beta0 * Intercept + beta1 * altitude, setting Intercept to 0 and altitude to 1 gives you beta1, with its estimation error. Another, maybe more direct way could be find by using the mixed models in package nlme. -- 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@stat.math.ethz.ch https://stat.ethz.ch/mailman/listinfo/r-sig-geo
