Here you can select one of the 11 built-in fitness functions of APS 3.0 (Relative with SR, Relative/Hits, Absolute with SR, Absolute/Hits, R-square, MSE, RMSE, MAE, RSE, RRSE, and RAE) and, depending on the fitness function, adjust a few parameters, such as the Selection Range and Precision for Relative with SR and Absolute with SR or the Precision for Relative/Hits and Absolute/Hits.

In the Fitness Function Tab used for Classification the 10 built-in fitness functions of APS 3.0 are listed (Number of Hits, Sensitivity/Specificity, PPV/NPV, R-square, MSE, RMSE, MAE, RSE, RRSE, and RAE), together with the adjustable 0/1 Rounding Threshold, fundamental for all fitness functions used in classification, including user defined fitness functions.

These are the 10 built-in fitness functions of APS 3.0 used for classification, but you can also design other fitness functions by selecting Custom in the Fitness Function list box. Indeed, for all problem categories, the Fitness Function Tab is also the place where you can design your own fitness function using the Custom Fitness Function window to write the code of your fitness function. The code for the custom fitness function must be in JavaScript and can be tested before evolving a model with it.