TABLE 4.

Significance testing with 90% confidence of the difference between the Avg % Match of recommendations and explanations with user top k preferred tags. The results show that explanations can tell more about the recommendation since they capture a user’s expressed tag preferences.

k	Avg%Match (rec., U, k)	Avg%Match (exp., U, k)	90% CI of the difference	Adjusted p-value
1	83.43%	85.85%	(−0.0482, −0.0003)	0.096
2	94.14%	94.94%	(−0.01469, −0.00148)	0.045
3	96.16%	96.96%	(−0.01469, −0.00148)	0.045