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MethodologyAbout

Automotive

DEDC Universal Precision Car Spark Plug Gap Tool, Billet Aluminum Spark Plug Caliper Threaded Spark Plugs (14mm)

Automotive4.4· 755 Amazon ratings

Bias-adjusted across 755 Amazon ratings, Bayesian-shrunk to the category prior so the headline score reflects relative quality — not a raw star average. Cohort: Automotive.

70.5%
Percentile · Global
75.5%
Percentile · Cohort
Automotive
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DEDC Universal Precision Car Spark Plug Gap Tool, Billet Aluminum Spark Plug Caliper Threaded Spark Plugs (14mm)

How the score was built

Amazon ratings
755

used for the Bayesian percentile

Raw star average
4.4 / 5

unadjusted Amazon mean

Bayesian avg
4.39

raw rating shrunk to the category prior

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Same category · Automotive

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