Research Article
Effect of Collaborative Recommender System Parameters: Common Set Cardinality and the Similarity Measure
Table 1
Sample dataset for 19 users with 12 items.
| | | | | | | | | | | | | | | | Rating mean | Similarity value | | PCC | COS | MWD | MMD |
| | | — | 3 | 1 | 5 | 4 | 0 | 4 | 5 | 3 | 0 | 2 | 2 | 1 | 3.0 | — | — | — | — | | | 1 | 0 | 0 | 5 | 0 | 4 | 0 | 0 | 0 | 3 | 0 | 0 | 0 | 4.00 | 1.00 | 1.00 | 1.00 | 0.75 | | | 1 | 0 | 1 | 0 | 0 | 1 | 0 | 0 | 0 | 2 | 0 | 0 | 0 | 1.33 | 1.00 | 1.00 | 1.00 | 0.444 | | | 1 | 0 | 0 | 0 | 0 | 3 | 0 | 0 | 2 | 3 | 0 | 0 | 0 | 2.67 | 0.00 | 1.00 | 0.50 | 0.444 | | | 1 | 0 | 0 | 1 | 0 | 4 | 0 | 0 | 0 | 3 | 0 | 0 | 0 | 2.67 | −1.00 | 1.00 | −1.00 | −0.89 |
| | | 2 | 2 | 0 | 5 | 0 | 4 | 0 | 0 | 0 | 3 | 0 | 0 | 0 | 3.50 | 0.707 | 0.987 | 0.75 | 0.640 | | | 2 | 0 | 1 | 0 | 0 | 1 | 0 | 0 | 0 | 2 | 0 | 0 | 2 | 1.50 | 0.000 | 0.949 | 0.75 | 0.375 | | | 2 | 0 | 0 | 0 | 0 | 3 | 0 | 0 | 2 | 4 | 0 | 2 | 0 | 2.75 | 0.707 | 0.981 | 0.75 | 0.688 | | | 2 | 3 | 0 | 1 | 0 | 4 | 0 | 0 | 0 | 3 | 0 | 0 | 0 | 2.75 | −0.99 | 0.759 | 0.00 | 0.00 |
| | | 5 | 2 | 0 | 5 | 0 | 5 | 0 | 4 | 2 | 5 | 0 | 3 | 0 | 3.71 | 0.451 | 0.975 | 0.60 | 0.485 | | | 5 | 2 | 1 | 0 | 0 | 1 | 0 | 0 | 3 | 2 | 1 | 0 | 2 | 1.71 | 0.311 | 0.937 | 0.70 | 0.400 | | | 5 | 4 | 0 | 0 | 3 | 3 | 0 | 0 | 2 | 4 | 0 | 2 | 3 | 3.00 | 0.236 | 0.914 | 0.50 | 0.500 | | | 5 | 3 | 0 | 1 | 0 | 4 | 0 | 1 | 4 | 3 | 0 | 3 | 0 | 2.71 | −0.86 | 0.727 | 0.00 | 0.00 |
| | | 8 | 2 | 2 | 5 | 4 | 5 | 3 | 4 | 2 | 5 | 0 | 3 | 0 | 3.50 | 0.612 | 0.973 | 0.625 | 0.536 | | | 8 | 2 | 1 | 0 | 0 | 1 | 3 | 2 | 3 | 2 | 1 | 1 | 2 | 1.80 | 0.512 | 0.922 | 0.50 | 0.300 | | | 8 | 4 | 0 | 0 | 3 | 2 | 2 | 4 | 2 | 3 | 2 | 2 | 3 | 2.70 | 0.369 | 0.927 | 0.50 | 0.450 | | | 8 | 3 | 5 | 1 | 2 | 4 | 2 | 1 | 4 | 3 | 0 | 3 | 0 | 2.80 | −0.92 | 0.681 | −0.13 | −0.12 |
| | | 10 | 3 | 5 | 1 | 2 | 0 | 2 | 1 | 3 | 0 | 4 | 4 | 5 | 3.00 | −1.00 | 0.636 | −0.20 | −0.20 |
| | | 8 | 0 | 5 | 1 | 2 | 0 | 2 | 1 | 0 | 0 | 4 | 4 | 5 | 3.00 | −1.00 | 0.565 | −0.50 | −0.50 |
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