Book
Summer Bridge Activities
Two parallel scores from 6 calibrated reviewers and 6 raw-average reviewers.
Z-normalized corrects for reviewer bias (every reviewer re-centered onto their personal scale). Raw average uses simple mean across the broader pool including stddev=0 reviewers.
Where this book sits
Z-normalized percentile · 5,285 ranked books
| Mean reviewer z-score | -0.825 |
|---|---|
| Calibrated raw-mean rating | 3.50 /5 |
| Broad raw-mean rating | 3.50 /5 |
| 90% CI-floor (z) | -1.496 |
| Reviewers (calibrated / broad) | 6 / 6 |
Summary
Summer Bridge Activities sits at the 8th z-normalized percentile across 5,285ranked books. The z-percentile differs from a raw star average because Rankquant subtracts each reviewer's personal baseline before aggregating — so a reader who rates everything 5 stars carries less weight than one who rates discerningly. Raw-average percentile is 2; the gap between the two measures how much bias-correction changes this title's standing. How percentiles are computed.
Pipeline applied to this title
The math, in this order
6 reviewers with rating variance re-centered onto a personal z-scale.
Mean z = -0.825. Broad raw mean = 3.50/5.
90% CI-floor = -1.496. Thin samples penalized.
Global 7.7. Z-track and raw-track ranked separately.
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