Research Article
Multiview Ensemble Method for Detecting Shilling Attacks in Collaborative Recommender Systems
| Attack model | | | | Items | Rating | Items | Rating | Rating |
| Random attack | Not used | | Randomly chosen | System mean | | Average attack | Not used | | Randomly chosen | Item mean | | AoP attack | Not used | | Top x% of most popular items | Item mean | | User random shifting | Not used | | Randomly chosen | System mean+random | | User average shifting | Not used | | Randomly chosen | Item mean+random | | Target random shifting | Not used | | Randomly chosen | System mean | | Target average shifting | Not used | | Randomly chosen | Item mean | | Power item attack | Power item | Ratings with normal distribution around item mean and standard deviation | | | | Power user attack | Copy of the power user’s items and ratings | | | | Bandwagon attack | Popular items | | Randomly chosen | System mean | | Love/Hate attack | Not used | | Randomly chosen | | | Reverse Bandwagon attack | Unpopular items | | Randomly chosen | System mean | |
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