question: @ Override public void countExample ( Example example ) { double plabel ; double label = example . getValue ( labelAttribute ) ; if ( ! predictedAttribute . isNominal ( ) ) { plabel = example . getValue ( predictedAttribute ) ; } else { String labelS = example . getValueAsString ( labelAttribute ) ; plabel = example . getConfidence ( labelS ) ; label = 1.0d ; } double weight = 1.0d ; if ( weightAttribute != null ) { weight = example . getValue ( weightAttribute ) ; } double diff = weight * Math . abs ( label - plabel ) ; deviationSum += diff ; double relDiff = Math . abs ( weight * label - ( trueLabelSum / exampleCounter ) ) ; relativeSum += relDiff ; }
target:  Calculates the error for the current example. 