Rules for absolute value types

This is the performance definition for absolute types. For absolute, any variance is not good.

Performance = 1 - | ((Actual - Target) / Target)|

With a target of zero, return:

Performance = 1 - | Actual |

For example:

Target Actual % Performance
100 150 50%
6 -3 -50%
0 2 -100%
0 -1 0%