Book
Empire of the Summer Moon: Quanah Parker and the Rise and Fall of the Comanches, the Most Powerful Indian Tribe in American History
Two parallel scores from 12 calibrated reviewers and 22 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 | +0.228 |
|---|---|
| Calibrated raw-mean rating | 4.83 /5 |
| Broad raw-mean rating | 4.91 /5 |
| 90% CI-floor (z) | -0.247 |
| Reviewers (calibrated / broad) | 12 / 22 |
Summary
Empire of the Summer Moon: Quanah Parker and the Rise and Fall of the Comanches, the Most Powerful Indian Tribe in American History sits at the 58th 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 65; 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
12 reviewers with rating variance re-centered onto a personal z-scale.
Mean z = +0.228. Broad raw mean = 4.91/5.
90% CI-floor = -0.247. Thin samples penalized.
Global 57.6. Z-track and raw-track ranked separately.
Similar percentile
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