Sample
4 redditors with explicit opinion · 3 positive · 1 negative · 0 neutral
Score
0.750 — formula: 0.75 × % positive + 0.25 × pos/neg ratio
Confidence95% CI: 30–95% · the true approval rate falls in this range with 95% statistical confidence
Verdict
Early Signal — ≥75% positive but with <10 redditors — small sample, treat as a hint, not a verdict.
Sources
r/tretinoin, r/40PlusSkinCare, r/SkincareAddictionUK