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Last update: February 19, 2014

 

SSPN Fitness Function

The SSPN fitness function combines four different statistics: the sensitivity, specificity, positive predictive value (PPV), and the negative predictive value (NPV).

The SSPP measure SSPNi of an individual model i is evaluated by the equation:

where SEi is the sensitivity, SPi the specificity, PPVi the positive predictive value, and NPVi the negative predictive value of the individual program i, and are given by the formulas:

where TPi, TNi, FPi, and FNi represent, respectively, the number of true positives, true negatives, false positives, and false negatives.

True positives (TP), true negatives (TN), false positives (FP), and false negatives (FN), are the four different possible outcomes of a single prediction for a binomial classification task with classes “1” (“yes”) and “0” (“no”). A false positive is when the outcome is incorrectly classified as “yes” (or “positive”), when it is in fact “no” (or “negative”). A false negative is when the outcome is incorrectly classified as negative when it is in fact positive. True positives and true negatives are obviously correct classifications. These four types of classifications are usually shown in a two-way table called the confusion matrix.

The SSPN fitness function can be combined with a cost matrix in order to impose specific constraints on the solutions. In addition, the evolvable logistic threshold, which is intrinsic to the logistic regression model, can be adjusted by changing the number of bins.


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