Rankquant
MethodologyAbout

Health, Household & Baby

Massage Ball Spiky Foot Massager Back Muscle Roller All Body Deep Tissue Trigger Point Therapeutic Massaging Exercise Roller Yoga Balls Physical Therapy Equipment Includes Free Tutorial and Holder Bag

Health, Household & Baby4.5· 89 Amazon ratings

Bias-adjusted across 89 Amazon ratings, Bayesian-shrunk to the category prior so the headline score reflects relative quality — not a raw star average. Cohort: Health, Household & Baby.

71.2%
Percentile · Global
60.1%
Percentile · Cohort
Health, Household & Baby
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Massage Ball Spiky Foot Massager Back Muscle Roller All Body Deep Tissue Trigger Point Therapeutic Massaging Exercise Roller Yoga Balls Physical Therapy Equipment Includes Free Tutorial and Holder Bag

How the score was built

Amazon ratings
89

used for the Bayesian percentile

Raw star average
4.5 / 5

unadjusted Amazon mean

Bayesian avg
4.39

raw rating shrunk to the category prior

Reviewer-graph z
0.707

bias-corrected vs. each reviewer's baseline (0 qualifying)

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Same category · Health, Household & Baby

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