// x = word frequency in the text snippets of one entity
    // y = word frequency in the text snippets of the other entity
    // xy = word frequency in the shared text snippets
    private Double mutualInformationAlgorithm(double x, double y, double xy) {
        return xy * Math.log((xy / (x * y)));
    }

    private Double confidenceScoreAlgorithm(double x, double y, double xy) {
        return Math.sqrt(xy*(x+y));
    }