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Automotive

NGK (1233) BPR5EY Spark Plug - Pack of 4

Automotive4.7· 366 Amazon ratings

Bias-adjusted across 366 Amazon ratings, Bayesian-shrunk to the category prior so the headline score reflects relative quality — not a raw star average. Cohort: Automotive.

94.3%
Percentile · Global
95.8%
Percentile · Cohort
Automotive
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NGK (1233) BPR5EY Spark Plug - Pack of 4

How the score was built

Amazon ratings
366

used for the Bayesian percentile

Raw star average
4.7 / 5

unadjusted Amazon mean

Bayesian avg
4.61

raw rating shrunk to the category prior

Reviewer-graph z
0.577

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

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Same category · Automotive

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