ClassificationMatrix.java

public static float calculateF1Score(float precision, float recall) {
    return calculateFScore(1, precision, recall);
}

public static float calculateFScore(double beta, float precision, float recall) {
    return (float) (1 + Math.pow(beta, 2)) * ((precision * recall) / (precision + recall));
}

public static float calculatePrecision(int truePositives, int falsePositives) {
    return truePositives / (float) (truePositives + falsePositives);
}

public static float calculateRecall(int truePositives, int falseNegatives) {
    return truePositives / (float) (truePositives + falseNegatives);
}

public static float calculateAccuracy(int truePositives, int trueNegatives, int realPositives, int realNegatives) {
    return (truePositives + trueNegatives) / (float) (realPositives + realNegatives);
}