Table 9. Results of existing benchmark 1 for STC & STS datasets Zainuddin, Selamat & Ibrahim (2018).

The bold emphasis shows the highest results of existing benchmark 1 for STC & STS datasets.

Approach	Features	Accuracy	Precision	Recall	F-Measure
ABSA+Sentiwordnet+PCA+SVM (STC)	POS tags+unigram	74.2438	0.751	0.742	0.738
ABSA+Sentiwordnet+PCA+SVM (STS)	POS tags	76.5517	0.779	0.766	0.76