Rules for decreasing value types

This is the performance definition for expense/decreasing types. For expenses, a lower number is better. This is the scope for non-zero target:

• If the actual equals the target, then the value is 100%.
• If the actual is one full target value below target (actual = target - absolute value of target), then the performance value is 200%.
• If the actual is one full target value above target (actual = target + absolute value of target), then the performance value is 0%.

With a non-zero target, the performance value calculation is:

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

With a target of zero, the calculation is:

Performance = 1 - Actual

For target of zero with decreasing type, scope is defined to be between 0 and 1.