Hi,
I am trying to explain some of my variables using a weighted linear
regression, with x and y-coordinates as my explanatory variables.
For example, I want to explain my variable 'agri' in the following way :
agri = x + y + x*y+ x^2 + y^2 where x and y are my coordinates and the
regression must be weighted by the variance.
How can I do it ? Thanks in advance !
JP
For illustration, here is a part of my database (var_agri = variance)
agri se_agri var_agri x y
1 -1.04E-05 4.47E-06 2.00E-11 23.78230555 2.968836238
2 -1.01E-05 4.36E-06 1.90E-11 26.05798185 4.476217345
3 -9.47E-06 4.55E-06 2.07E-11 30.5248107 3.058706843
4 -1.00E-05 4.22E-06 1.78E-11 26.97325452 0.737615804
5 -9.96E-06 3.74E-06 1.40E-11 17.67392327 -3.908029603
6 -1.05E-05 4.44E-06 1.97E-11 25.92926863 3.114662312
7 -1.01E-05 4.35E-06 1.89E-11 25.4312434 1.572565497
8 -6.54E-06 4.38E-06 1.92E-11 20.07104333 1.048456276
9 -9.65E-06 4.38E-06 1.91E-11 23.92598192 1.728975609
10 -7.39E-06 4.20E-06 1.76E-11 21.2291592 0.489260168
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