[R-sig-Geo] Cokriging unbiasedness condition

Edzer Pebesma edzer.pebesma at uni-muenster.de
Wed Apr 6 13:02:13 CEST 2011

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
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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.pebesma at wwu.de

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