Trust from similarity If there is no social network with trust values how do we compute trust? Assuming there are underlying ratings, can we compute trust from similarity How does this differ from collaborative filtering Exercise for the audience 1. Your Favorite movie ★★★★★ 2. Your least favorite movie ★★★★★ 3. Some Mediocre Movie ★★★★★ 4 Some mediocre movie ★★★★★ Some mediocre movie ★★★★★ 6. Some mediocre movie ★★★★ 7. Some mediocre movie ★★★★★ 8. Some mediocre movie ★★★★★ 9. Some mediocre movie ★★★★★ 0. Some mediocre movie ★★★★★ 20/3910 19/39 Trust from Similarity  If there is no social network with trust values, how do we compute trust?  Assuming there are underlying ratings, can we compute trust from similarity?  How does this differ from collaborative filtering? 20/39 1. Your Favorite Movie ★★★★★ 2. Your Least Favorite Movie ★★★★★ 3. Some Mediocre Movie ★★★★★ 4. Some Mediocre Movie ★★★★★ 5. Some Mediocre Movie ★★★★★ 6. Some Mediocre Movie ★★★★★ 7. Some Mediocre Movie ★★★★★ 8. Some Mediocre Movie ★★★★★ 9. Some Mediocre Movie ★★★★★ 10. Some Mediocre Movie ★★★★★ Exercise for the audience