Table 13.

Sentiment classification on different datasets according to the different number of distinct windows (before random selection).

Android
Model	Metric\window	1	2	3	4	5	6
WJST	Accuracy1	0.8375	0.78	0.7925	0.7425	0.725	0.9075
	Accuracy2	0.83	0.77	0.7775	0.735	0.725	0.9075
	Perplexity	18.3948	16.7266	16.7303	16.166	15.9499	15.1128
	Topic_Coh	−1.4063	−0.9279	−0.5547	−1.2929	−1.7475	−0.746
WJST1	Accuracy1	0.8975	0.8525	0.81	0.8675	0.755	0.8025
	Accuracy2	0.8825	0.83	0.7925	0.8675	0.75	0.7875
	Perplexity	19.3734	18.0031	16.6787	16.8518	16.1015	16.5461
	Topic_Coh	−2.2084	−1.6272	−0.1870	−0.7753	−1.328	−1.7836
Automotive
WJST	Accuracy1	0.7775	0.74	0.755	0.735	0.7375	0.69
	Accuracy2	0.7725	0.745	0.7475	0.745	0.725	0.685
	Perplexity	23.6365	21.7712	21.2008	20.9688	20.5095	19.6748
	Topic_Coh	−1.1684	−1.7095	−1.6542	−0.2824	−1.7604	−0.1311
WJST1	Accuracy1	0.805	0.8125	0.8	0.7575	0.78	0.7725
	Accuracy2	0.805	0.7975	0.79	0.755	0.78	0.7725
	Perplexity	23.2684	22.2601	21.4357	20.8092	20.5091	20.2379
	Topic_Coh	−1.7318	−0.5912	−1.1883	−0.7637	−0.62	−0.5134
Electronic
WJST	Accuracy1	0.845	0.7675	0.8625	0.7325	0.7775	0.7325
	Accuracy2	0.845	0.7575	0.875	0.7275	0.7825	0.7225
	Perplexity	22.561	22.0462	20.5489	20.7952	20.7495	20.0283
	Topic_Coh	−0.8471	−0.6207	−2.0442	−1.4345	−0.786	−0.9412
WJST1	Accuracy1	0.8025	0.875	0.79	0.8675	0.8625	0.835
	Accuracy2	0.7975	0.87	0.8	0.865	0.8625	0.8375
	Perplexity	23.5903	23.546	22.6012	22.8559	21.8897	21.4464
	Topic_Coh	−0.8251	−0.9581	−1.1683	−1.2189	−0.8492	−0.3402
Movie
WJST	Accuracy1	0.855	0.815	0.7225	0.6575	0.7	0.765
	Accuracy2	0.845	0.7975	0.71	0.6625	0.685	0.765
	Perplexity	24.5779	24.5153	23.1145	23.1209	23.2709	22.2328
	Topic_Coh	−0.4063	−0.0216	−0.0751	−2.5351	−0.0888	−0.0791
WJST1	Accuracy1	0.9725	0.9775	0.97	0.965	0.575	0.595
	Accuracy2	0.96	0.965	0.9625	0.955	0.5875	0.5725
	Perplexity	26.117	25.09	24.6302	23.9778	22.7068	22.3572
	Topic_Coh	−0.1348	−0.1348	−0.1348	−0.0315	−0.0378	−0.0106
Average section
WJST	Accuracy1	0.8287	0.7756	0.7831	0.7168	0.735	0.7737
	Accuracy2	0.8231	0.7675	0.7775	0.7175	0.7293	0.77
	Perplexity	22.2925	21.2648	20.3986	20.2627	20.1199	19.2621
	Topic_Coh	−0.957	−0.8199	−1.082	−1.3862	−1.0956	−0.4743
WJST1	Accuracy1	0.8693	0.8793	0.8425	0.8643	0.7431	0.7512
	Accuracy2	0.8612	0.8656	0.8362	0.8606	0.745	0.7425
	Perplexity	23.0872	22.2248	21.3364	21.1236	20.3017	20.1469
	Topic_Coh	−1.225	−0.8278	−0.6696	−0.6973	−0.7087	−0.6619