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Fig. 4.7 Abitibi area; the copper weights of Fig. 4.5 were regressed on the ten variables for
(10 km
10 km) cells and all possible cross-products of these variables ( cf . Table 4.4 ); contour
pattern changes when increasingly more of these variables are included using stepwise multiple
regression. Number of variables is (a)1;(b)2;(c)4;(d)8;(e) 16; (f) 32; (g) 51 (Source: Agterberg
1974 , Fig. 124)
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