Table 6.

Statistics of reviews from five datasets.

Datasets	Number of users	Percentage of total users (%)	Number of items	Percentage of total items (%)
Digital music	4449 ($n\le$ 13)	80.29	2892 ($m\le$ 20)	81.05
Baby	15,991 ($n\le$ 10)	82.23	5666 ($m\le$ 28)	80.37
Office products	4024 ($n\le$ 10)	82.04	1979 ($m\le$ 11)	81.78
Beauty	18,117 ($n\le$ 10)	81.01	9712 ($m\le$ 19)	80.26
Yelp	932,169 ($n\le$ 15)	81.48	139,767 ($m\le$ 20)	80.32