The system is pre-set to find the best combinations (using the Standard Rating). You can also find the worst ball numbers by inverting the rating mechanism.
Using the Exponential and Alternative buttons, you can adjust the magnitude of rating values.
The Exponential system gives a much higher rating to better combinations.
This means good combinations can be separated from bad combinations more quickly.
However, because the system is quite coarse, it can fail to distinguish good combinations from slightly better ones.
If you find the Exponential system is not accurate enough, you should revert to the alternative rating system.