[Retracted] A Personalized Recommendation System for English Teaching Resources Based on Multi-K Nearest Neighbor Regression Algorithm

Table 1

Experimental data set.

Data set	Score value	Describe
CNKI	1∼5	1675 users with 100010 ratings
FirstSearch	−10∼10	73,654 users with 12,579,643 ratings
IEEE Xplore	1 or −1	23,651,458 followers, 23,574,125 ratings