Kristofer Munsterhjelm wrote:
[snip]
Oops, let's try those tables again.
desired actual diff
100: A B C D r(100/41) = 2 2 (B and D) << L 0
68: A B D r(68/41) = 2 2 (B and D) 0
32: A C D r(32/41) = 1 1 (D) 0
34: A D r(34/41) = 1 1 (D) 0
33: B D r(33/41) = 1 2 (B and D) 1
32: C D r(32/41) = 1 1 (D) 0
33: A 1 0 1
33: B 1 0 1
32: C 1 0 1
2: D 0 1 1
should be
desired actual diff
100: A B C D r(100/41) = 2 2 (B and D) << L 0
68: A B D r(68/41) = 2 2 (B and D) 0
32: A C D r(32/41) = 1 1 (D) 0
34: A D r(34/41) = 1 1 (D) 0
33: B D r(33/41) = 1 2 (B and D) 1
32: C D r(32/41) = 1 1 (D) 0
33: A 1 0 1
33: B 1 0 1
32: C 1 0 1
2: D 0 1 1
The squared error is 5, and so the RMSE is sqrt(0.5) ~ 0.7. This is,
incidentally, the best score for BD.
Another example, this time with the council {B, C} and divisor 47:
desired actual diff
100: A B C D r(100/47) = 2 2 (B and C) << L 0
68: A B D r(68/47) = 1 1 (B) 0
32: A C D r(32/47) = 1 1 (C) 0
34: A D r(34/47) = 1 0 1
33: B D r(33/47) = 1 1 (B) 0
32: C D r(32/47) = 1 1 (C) 0
33: A 1 0 1
33: B 1 1 0
32: C 1 1 0
2: D 0 0 0
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