Analyzing Results

How to interpret A/B test data and make decisions

Last updated: 2025-01-16

Results analysis is where you determine if your experiment produced meaningful insights. CheckoutOS provides comprehensive analytics to help you understand what happened and make confident decisions.

Results Dashboard

The experiment results dashboard shows:

  • Performance summary — Key metrics for each variant
  • Statistical significance — Confidence in the results
  • Lift calculation — How much better/worse the variant performed
  • Sample sizes — Traffic received by each variant
  • Trend graphs — Performance over time

Understanding Key Metrics

Results Summary
{
  "experiment_results": {
    "status": "significant",
    "winner": "Variant A",
    "runtime_days": 14,
    "total_visitors": 12500,
    "variants": [
      {
        "name": "Control",
        "visitors": 6250,
        "conversions": 312,
        "conversion_rate": "4.99%",
        "revenue": 28750,
        "aov": 92.15
      },
      {
        "name": "Variant A",
        "visitors": 6250,
        "conversions": 387,
        "conversion_rate": "6.19%",
        "revenue": 35418,
        "aov": 91.52,
        "lift": "+24.0%",
        "p_value": 0.003,
        "confidence": "99.7%"
      }
    ]
  }
}

Statistical Significance

Statistical significance tells you whether the observed difference is likely real or could be due to random chance:

Significance Indicators

  • 95% confidence — Standard threshold for declaring a winner
  • 99% confidence — High confidence, very unlikely to be random
  • P-value < 0.05 — Statistically significant at 95% level
  • Confidence interval — Range where true value likely falls
Avoid Peeking

Checking results repeatedly and stopping when you see significance inflates your false positive rate. Set a sample size target and stick to it.

Interpreting Results

Clear Winner

When results show statistical significance and meaningful lift:

  1. Document the winning variant and key learnings
  2. Roll out the winner to 100% of traffic
  3. Monitor post-rollout metrics to confirm
  4. Plan your next experiment

No Significant Difference

When variants perform similarly:

  • This is still valuable — you learned the change doesn't matter
  • Consider if the test ran long enough
  • The simpler/cheaper option may be preferable
  • Document and move on to testing bigger changes

Unexpected Results

When the variant performs worse than expected:

  • Don't dismiss negative results — they're valuable
  • Investigate why it didn't work
  • Check for implementation errors
  • Consider if you tested the right audience

Segment Analysis

Break down results by customer segments to find hidden insights:

Segment Breakdown
{
  "segment_analysis": {
    "by_device": {
      "mobile": { "control": "4.2%", "variant": "6.8%", "lift": "+62%" },
      "desktop": { "control": "5.5%", "variant": "5.4%", "lift": "-2%" }
    },
    "by_customer_type": {
      "new": { "control": "3.1%", "variant": "5.2%", "lift": "+68%" },
      "returning": { "control": "7.8%", "variant": "7.4%", "lift": "-5%" }
    },
    "by_cart_value": {
      "under_50": { "control": "5.1%", "variant": "6.2%", "lift": "+22%" },
      "50_to_100": { "control": "4.9%", "variant": "6.1%", "lift": "+24%" },
      "over_100": { "control": "4.8%", "variant": "6.3%", "lift": "+31%" }
    }
  }
}
Segment Insights

Sometimes an overall "no winner" hides a big win in a specific segment. Mobile users might love a change that desktop users hate. Segment analysis reveals these opportunities.

Exporting Results

Export experiment data for further analysis:

Export Options

  • CSV export — Raw data for spreadsheet analysis
  • PDF report — Shareable summary document
  • API access — Programmatic data retrieval
  • Analytics integration — Send to Google Analytics, Mixpanel, etc.

Concluding Experiments

1

Verify Significance

Ensure results have reached statistical significance.
2

Document Findings

Record hypothesis, results, and learnings.
3

Declare Winner

Choose winner or declare inconclusive.
4

Roll Out

Apply winning variant to 100% of traffic.
5

Monitor

Watch metrics post-rollout to confirm improvement holds.

Best Practices

Analysis Tips
  • Wait for significance — Don't call winners too early
  • Look at multiple metrics — Conversion isn't everything
  • Check segments — Overall results may hide segment differences
  • Consider business impact — Small lift on high traffic = big value
  • Document everything — Build an experiment knowledge base

Related Topics

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