B
Evidence Grade B
Graded
accuracy verified by the review judge
Safe to Cite
Recent
191,000
191,000 -- required sample size per group for A/A testing at 0.6% click-through rate (2025)
For a typical click-through rate of 0.6%, approximately 191,000 visitors per group are required to detect a change to 0.65%.
- Example calculation based on detecting a change from 0.6% to 0.65% CTR
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Lighthouse Research Team
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Source verified
Evidence graded
Value
191,000
Unit
Count
Data Vintage
2025
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
Kirro
Primary
Tier B
https://kirro.io/aa-testing ↗
Source Article
AA test: how to run one and read the results
An AA test (also called an A/A test) runs two identical versions of the same page against each other. Same content. Same design. Same everything. The goal isn’t to find a winner. It’s to make sure your testing tool actually works before you trust it with real decisions.
Think of it like stepping on …
Original Research
Kirro
· Original study ↗
Methodology
Statistical power calculation example to detect change to 0.65%
Methodology documented
Segmentation
Industrymarketing
Cite this stat
Plain Text
A/A testing at 0.6% click-through rate: 191,000 required sample size per group. Source: Kirro (2025). Via Lighthouse Intelligence -- https://lighthousedata.io/data/aa-test-sample-size-ctr
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<blockquote cite="https://lighthousedata.io/data/aa-test-sample-size-ctr" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>191,000</strong> -- required sample size per group for A/A testing at 0.6% click-through rate<br><small>Source: Kirro (2025) · <a href="https://lighthousedata.io/data/aa-test-sample-size-ctr" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
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