private Class<? extends UserSimilarity> getSelectedUserSimilarityClass() {
		Class<? extends UserSimilarity> clazz = LogLikelihoodSimilarity.class;
		
		if (similarClassBox.getSelectedIndex() == 1) {
			clazz = CityBlockSimilarity.class;
		} else if (similarClassBox.getSelectedIndex() == 2) {
			clazz = EuclideanDistanceSimilarity.class;
		} else if (similarClassBox.getSelectedIndex() == 3) {
			clazz = PearsonCorrelationSimilarity.class;
		} else if (similarClassBox.getSelectedIndex() == 4) {
			clazz = SpearmanCorrelationSimilarity.class;
		} else if (similarClassBox.getSelectedIndex() == 5) {
			clazz = TanimotoCoefficientSimilarity.class;
		} else if (similarClassBox.getSelectedIndex() == 6) {
			clazz = UncenteredCosineSimilarity.class;
		} 
		return clazz;
	}