ADDITIONAL SLIDES

Trust-aware Decentralized Recommender Systems

Paolo Massa, PhD candidate

Advisor: Paolo Traverso / Co-advisor: Paolo Avesani

CF formulas

Pearson Correlation Coefficient

Ratings prediction formula

Ratings distribution

Controversiality levels

Out of the 84601 users who received at least one statement,

67511 are 0-controversial,

17090 users (more than 20%) are 1-controversial (at least one user disagrees with the others),

1247 are at least 10-controversial,

144 are at least 40-controversial

and one user is 212-controversial

Decentralization

MoleTrust step 1

MoleTrust step 2

MoleTrust step 3

(0.8 * 0.6) + (1.0 * 0.9) / 0.8 + 1.0 = 0.767

THE REAL END

Every end is a new beginning ...