[ai-geostats] Re: the sum of the simple kriging weights
The simple kriging weights are not constrained in any
way, either in sum or in sign.
Solving the simple kriging system gives a regression
equation which 'best' predicts the value at the
specified location. This is usually adjusted to be
unbiassed by applying the 'rest' (1 - sum of weights)
to the global average.
I have had cases where the simple kriging weights
added up to 2.
--- Andreas Dominik Cullmann <acullma@...> wrote:
> Hi all,to
> the simple kriging weights do not sum to a constant.
> From Olea (1999): 'Geostatistics for engineers and
> earth scientists',
> Kluwer, Boston, p.60:
> '(c) The possibility of having negative weights
> implies that the
> estimate is not confined to the data interval;...'
> To me, this sounds like if the sum of the simple
> kriging weights
> is resticted to some interval, especially since I've
> never seen
> any sum of weights not in [0,1].
> Does anybody know any hint, evidence or proof of
> such a
> Thanks a lot.
> Andreas Dominik Cullmann
> Institut fuer forstliche Biometrie und Informatik
> Buesgenweg 4
> 37077 Goettingen
> Tel: ++49-551-39-3462
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