V R2 MCP SE A L G Bas B Ty Y Con W F 1 2.1 1.5 -0.8 0.33511 X                 1 1.1 0.5 0.8 0.33677             X     2 2.9 1.7 -0.2 0.33465 X           X     2 2.8 1.6 -0.0 0.33481 X             X   3 3.7 1.9 0.5 0.33434 X           X X   3 3.6 1.8 0.6 0.33446 X X           X   4 4.6 2.2 1.1 0.33384 X X         X X   4 4.0 1.6 2.0 0.33483 X X     X   X     5 5.0 2.0 2.4 0.33419 X X     X   X X   5 4.8 1.8 2.8 0.33460 X X         X X X 6 5.2 1.6 4.1 0.33487 X X     X   X X X 6 5.1 1.5 4.3 0.33511 X X     X X X X   7 5.2 1.0 6.0 0.33586 X X     X X X X X 7 5.2 1.0 6.1 0.33591 X X   X X   X X X 8 5.3 0.4 8.0 0.33691 X X   X X X X X X 8 5.2 0.4 8.0 0.33694 X X X   X X X X X 9 5.3 0.0 10.0 0.3800 X X X X X X X X X

Table 5: Best subsets regression: log (C) versus all factors. R2, adjusted , Mallow’s Cp (MCP) and standard error (SE) in each subset is presented. V denotes the number of factors included within each model.