Book
The Useful Knots Book: How to Tie the 25+ Most Practical Rope Knots (Escape, Evasion, and Survival)
Two parallel scores from 5 calibrated reviewers and 7 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 | -0.311 |
|---|---|
| Calibrated raw-mean rating | 4.20 /5 |
| Broad raw-mean rating | 4.43 /5 |
| 90% CI-floor (z) | -1.047 |
| Reviewers (calibrated / broad) | 5 / 7 |
Summary
The Useful Knots Book: How to Tie the 25+ Most Practical Rope Knots (Escape, Evasion, and Survival) sits at the 21th 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 18; 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
5 reviewers with rating variance re-centered onto a personal z-scale.
Mean z = -0.311. Broad raw mean = 4.43/5.
90% CI-floor = -1.047. Thin samples penalized.
Global 21. Z-track and raw-track ranked separately.
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