www-ai.cs.tu-dortmund.de/LEHRE/SEMINARE/MUSIK/2006/Towards%20the%20Next%20Generation%20of%20Recommender%20Systems.pdf
ratings of some other (usually, the N most similar) users for the same item s:
rc;s ¼ aggr c02ĈC
rc0;s; ð9Þ
where ĈC denotes the set of N users that are the most similar to user c and who have rated item s [...] methods, which
helps to avoid certain limitations of content-based and
collaborative systems [8], [9], [21], [76], [94], [100], [105].
Different ways to combine collaborative and content-based
methods [...] Unifying Recommendation
Model
Many researchers have followed this approach in recent years. For instance, [9] proposes using content-based and collaborative characteristics (e.g., the age or gender of users or …