hello list,
how to simultanously use two "variables of influence" - say x and y (not
coordinates!) -
and use them as one external drift variable - say z - within wingslib
(kriging with
external drift)? what is an appropiate way of combination?:
1. summation (z=x+y)?
2. multiplication (z=x*y)?
3. doing a multiple linear regression analysis first (primary variable as
dependent variable!) and use the resulting trend (z=a+b1*x+b2*y)?
4. any other way??
hope somebody has some suggestions
regards
Lenz
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