A Cross-Domain Collaborative Filtering Algorithm Based on Feature Construction and Locally Weighted Linear Regression

Table 2

Statistics of the first data set for evaluation.

Domain		Avg. # of ratings for each item	Avg. # of ratings for each user	Density
Music CDs	100	50.03	11.5	11.50%
Books	100	62.74	14.42	14.42%
DVDs	100	59.12	13.59	13.59%
VHS video tapes	100	50.03	11.5	11.50%