Advances in Artificial Intelligence / 2016 / Article / Tab 2

Research Article

Effect of Collaborative Recommender System Parameters: Common Set Cardinality and the Similarity Measure

Table 2

Results classification according to the rating mean groups.

Sequence of usersSimilarity measureSequence of similarity valuesMaximum difference


(high mean group)
PCC1 → 0.707 → 0.451 → 0.6120.549
COS1 → 0.987 → 0.975 → 0.9730.027
MWD1 → 0.75 → 0.6 → 0.6250.4
MMD0.75 → 0.64 → 0.485 → 0.5360.265


(low mean group)
PCC1 → 0 → 0.311 → 0.5121
COS1 → 0.949 → 0.937 → 0.9220.078
MWD1 → 0.75 → 0.7 → 0.50.5
MMD0.444 → 0.375 → 0.4 → 0.30.144


(medium mean group)
PCC0 → 0.707 → 0.236 → 0.3690.707
COS1 → 0.981 → 0.914 → 0.9270.086
MWD0.5 → 0.75 → 0.5 → 0.50.25
MMD0.444 → 0.688 → 0.5 → 0.450.244


(opposite-minded group)
PCC−1 → −0.99 → −0.86 → −0.92−0.14
COS1 → 0.759 → 0.727 → 0.6810.319
MWD−1 → 0 → 0 → −0.13−1
MMD− 0.89 → 0 → 0 → −0.12−0.89

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