Table 3.

Classification performance of support vector machine (SVM) classifier for side effects of methylphenidate.

SVM classifier	F1 score for side effects	F1 score for negative	Precision	Recall	Accuracy
Final model	0.733	0.987	0.920	0.609	0.976
Without side effect terms	0.316	0.976	0.880	0.193	0.954
Without personal noun	0.388	0.978	0.887	0.248	0.957
Without sentiment scores	0.571	0.982	0.918	0.414	0.966
Without a URL	0.722	0.987	0.922	0.594	0.975