B
Evidence Grade B
Graded
accuracy verified by the review judge
Safe to Cite
Current
16%
16% -- perceived quality lift for espresso machine (positive reviews plus irrelevant negative review) (2026)
An espresso machine was perceived as 16% better when positive reviews were accompanied by a negative but mostly irrelevant review.
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Lighthouse Research Team
Last verified:
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Source verified
Evidence graded
Value
16%
Unit
Percentage
Data Vintage
2026
Entity
Evidence Quality
B
Strong, reliable evidence
Sourced from a well-regarded research firm or industry leader with transparent methodology and a reasonably large sample.
Single source - not yet corroborated
Score breakdown
Extraction
75
Source Trust
60
Citation Chain
20
Independence
30
Methodology
45
Freshness
95
Source
Science Says
Primary
Tier B
https://app.sciencesays.com/archive?page=31 ↗
Source Article
Science Says
Original Research
Science Says
· Original study ↗
Methodology
Experimental study cited by Science Says
Methodology documented
Segmentation
Industrymarketing
Cite this stat
Plain Text
espresso machine (positive reviews plus irrelevant negative review): 16% perceived quality lift. Source: Science Says (2026). Via Lighthouse Intelligence -- https://lighthousedata.io/data/mixed-reviews-espresso-machine-16pct
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<blockquote cite="https://lighthousedata.io/data/mixed-reviews-espresso-machine-16pct" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>16%</strong> -- perceived quality lift for espresso machine (positive reviews plus irrelevant negative review)<br><small>Source: Science Says (2026) · <a href="https://lighthousedata.io/data/mixed-reviews-espresso-machine-16pct" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
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