Beauty & Personal Care
Itchy Scalp Treatment
Bias-adjusted across 789 Amazon ratings, Bayesian-shrunk to the category prior so the headline score reflects relative quality — not a raw star average. Cohort: Beauty & Personal Care.
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How the score was built
- Amazon ratings
- 789
- Raw star average
- 3.5 / 5
- Bayesian avg
- 3.59
- Reviewer-graph z
- -0.577
used for the Bayesian percentile
unadjusted Amazon mean
raw rating shrunk to the category prior
bias-corrected vs. each reviewer's baseline (0 qualifying)
Buy it: View on Amazon →
Same category · Beauty & Personal Care
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