Dynamic Group Recommendation Algorithm Based on Member Activity Level

Table 5

Experimental results of F-measure in MovieLens.

Algorithm	NMF + K-means			K-means			Randomly
	5	10	20	5	10	20	5	10	20
SVD_AVG	0.711	0.653	0.516	0.612	0.558	0.432	0.154	0.128	0.101
SVD_LM	0.702	0.522	0.462	0.579	0.536	0.413	0.105	0.082	0.079
SVD_MP	0.683	0.517	0.472	0.617	0.544	0.502	0.169	0.134	0.119
SVD_Act	0.698	0.538	0.496	0.583	0.560	0.513	0.135	0.127	0.092
timeSVD++_AVG	0.729	0.672	0.519	0.625	0.562	0.453	0.191	0.169	0.139
timeSVD++_LM	0.708	0.543	0.470	0.585	0.531	0.422	0.190	0.154	0.118
timeSVD++_MP	0.693	0.547	0.484	0.622	0.573	0.496	0.204	0.169	0.115
WBF [34]	0.742	0.652	0.578	0.623	0.562	0.499	0.342	0.323	0.272
MCS [24]	0.732	0.678	0.606	0.646	0.585	0.516	0.352	0.311	0.264
DMA	0.744	0.664	0.628	0.613	0.582	0.548	0.339	0.326	0.289