# kaal:claim:3266953-007

**Claim.** Displayed net feedback scores are a poor reputation instrument because they encourage Pollyanna assessments of reputation and are far from the best predictor of performance available in the data.

**Type.** failure  **Support.** evidenced

**Holds when.**

- eBay feedback data from 1999

**Source quote.**

> However, the net feedback scores that eBay displays encourages Pollyanna assessments of reputations, and is far from the best predictor available.

**From.** Craig Calcaterra, Wulf A. Kaal, Gopinath Sivalingam, *Reputation Protocol for the Internet of Trust - Conceptual Whitepaper* (2018), Internet-Based Platforms Use of Reputation Metrics, page 8

**Cite as.** Craig Calcaterra, Wulf A. Kaal, Gopinath Sivalingam, Reputation Protocol for the Internet of Trust - Conceptual Whitepaper (2018). SSRN: https://ssrn.com/abstract=3266953

**Verify.** sha256 of source PDF `781758dea356e55d79c73ad7f1debe7c83de398bd1cd9e0a9a6c2802f276b4c0` at https://raw.githubusercontent.com/wulfkaal/Academic-Papers/main/papers/pdf/Calcaterra%20et%20al.%20-%202018%20-%20Reputation%20Protocol%20for%20the%20Internet%20of%20Trust%20-%20Conceptual%20Whitepaper.pdf

**Failure mode.** Pollyanna feedback bias  (family: reputation-system-gaming)

**Topics.** reputation

**Keywords.** reputation-systems, feedback-bias, ebay, prediction

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