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

Table 1

Statistics of the first data set for evaluation.

Domain		Avg. # of ratings for each item	Avg. # of ratings for each user	Density
Books	100	29.89	6.03	6.03%
Music CDs	100	34.65	6.99	6.99%
DVDs	100	61.77	12.45	12.45%
VHS video tapes	100	59.43	11.98	11.98%