The improvement percentage of the SCL against the PBS, HHP and OHHP methods.

The improvement percentage of the SCL against the PBS, HHP and OHHP in the overall ranking score , the object-degree dependent ranking score , the overall precision , the object-degree dependent precision , the overall recall , the object-degree dependent recall , the novelty , the inter-diversity and the inner-diversity are shown for the Netflix(NET), the MovieLens(MOV) and the RYM, with . To guide the eyes, if the indicator of the SCL outperforms other methods, we show the improvement percentage as a positive value, otherwise, as a negative value. The blank in the form indicates an infinite value owing to the zero value of the PBS’s precision and recall.