Book
How to Quilt: A Beginner’s Guide to Learn How to Quilt Step-by-Step (Crafts for Beginners)
Two parallel scores from 3 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. The 18-point gap is the rating-inflation signature for this title — the casual crowd liked it more than discriminating reviewers (a classic inflation pattern).
Where this book sits
Z-normalized percentile · 5,285 ranked books
| Mean reviewer z-score | -1.188 |
|---|---|
| Calibrated raw-mean rating | 4.00 /5 |
| Broad raw-mean rating | 4.50 /5 |
| 90% CI-floor (z) | -2.138 |
| Reviewers (calibrated / broad) | 3 / 6 |
Summary
How to Quilt: A Beginner’s Guide to Learn How to Quilt Step-by-Step (Crafts for Beginners) sits at the 4th 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 22; 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
3 reviewers with rating variance re-centered onto a personal z-scale.
Mean z = -1.188. Broad raw mean = 4.50/5.
90% CI-floor = -2.138. Thin samples penalized.
Global 3.5. Z-track and raw-track ranked separately.
Similar percentile
