Universal Kriging with factor covariate
krige() supports the use of factors. Mailing the error message without the command that generated it doesn't help us forward. Most useful would be a small reproducable example.
On 02/09/2011 08:32 PM, piero campa wrote:
Hi list, I am applying Universal Kriging (a.k.a. Regression-kriging, etc), and whether I use a factor variable as covariate (to feed the linear regression model by lm() call), I get this error: Error in function (classes, fdef, mtable) : unable to find an inherited method for function "krige", for signature "call", "SpatialPointsDataFrame" The same is for krige.cv. I managed to run UK by manually adding to my Spatial object explicitly the dummy 0/1 variables for each category used in the formula of the regression model; but I wonder if I am doing something wrong or actually the krige method does not support factor covariates. Thank you, Piero Campalani
Edzer Pebesma Institute for Geoinformatics (ifgi), University of M?nster Weseler Stra?e 253, 48151 M?nster, Germany. Phone: +49 251 8333081, Fax: +49 251 8339763 http://ifgi.uni-muenster.de http://www.52north.org/geostatistics e.pebesma at wwu.de