[EM] Divisor-based individual PR method?

[Kristofer Munsterhjelm]

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