Split Testing Using Real Data
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This is my presentation from June's Shame On UX, where we focused on split testing using real conversion data and confidence intervals to evaluate test results.
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Split Testing Using Real Data
- 2. Split Testing 101 KISS If you can’t measure it, you can’t test it For clean data you can only test ONE element at a time Attribution is everything Follow @ShameOnUX
- 3. Types of Conversions • Purchase • Contact • Phone Call • Sign-up • Subscription (on-going purchase) • Content • Share • Time on site / page • Pages per visit • Download Follow @ShameOnUX
- 4. A Quick Note… When testing for specific conversions, focus on specific signals that drive the specific conversion. • Purchase vs. Sign up • Submit content vs. Get the click • Social Share vs. Link-bait Follow @ShameOnUX
- 5. Split Test 1 Goal: Increase Content Acquisition Conversion: Form Submittal Type: user Generated Review Motivation: Share frustration, publicize experience, receive sentiment, receive compensation Follow @ShameOnUX
- 6. Split Test 1 Control Follow @ShameOnUX
- 7. Split Test 1 Variation 1: Remove Unnecessary and potentially distracting page elements Element: Main Navigation Follow @ShameOnUX
- 9. Split Test 1, Variation 1 Test Results Conversion Increase: 63% Visitors Conversions Conversion Rate Standard Error Control 11643 961 8.25% 0.26% Variation 12564 1689 13.44% 0.30% 95% Conversion Rate Limits From To Significant At 7.83% 8.67% 95% confidence: YES 12.94% 13.95% 99% confidence: YES 99% Conversion Rate Limits Z-score -13.069389 From To 7.75% 8.75% P-value 2.5E-39 12.85% 14.04% Follow @ShameOnUX
- 10. Split Test 1 Variation 2: Add elements of social proof Element: Most recent reviews from other users Follow @ShameOnUX
- 12. Variation 2 Test Results Conversion Increase: 105% Visitors Conversions Conversion Rate Standard Error Control 15263 2106 13.80% 0.28% Variation 14007 3957 28.25% 0.38% 95% Conversion Rate Limits From To Significant At 13.34% 14.26% 95% confidence: YES 27.62% 28.88% 99% confidence: YES 99% Conversion Rate Limits Z-score -30.628883 From To 13.25% 14.35% P-value 3E-206 27.50% 29.00% Follow @ShameOnUX
- 13. Split Test 2 Goal: User Sign-Up Conversion: Form Submittal Type: Personal Information Submission Motivation: Interested in starting free trial Follow @ShameOnUX
- 14. Split Test 2 Control Follow @ShameOnUX
- 15. Split Test 2 Variation 1: Change Call-to-Action text Element: Button Follow @ShameOnUX
- 17. Split Test 2, Variation 1 Test Results Conversion Increase: 25% Visitors Conversions Conversion Rate Standard Error Control 1254 112 8.93% 0.81% Variation 1304 145 11.12% 0.87% 95% Conversion Rate Limits From To Significant At 7.60% 10.26% 95% confidence: YES 9.68% 12.56% 99% confidence: NO 99% Conversion Rate Limits Z-score -1.8450767 From To 7.35% 10.51% P-value 0.03251 9.41% 12.83% Follow @ShameOnUX
- 18. Split Test 2 Variation 2: Prominent Display of Price Element: Sub-title / Text Follow @ShameOnUX
- 20. Split Test 2, Variation 1 Test Results Conversion Increase: 42% Visitors Conversions Conversion Rate Standard Error Control 1366 151 11.05% 0.85% Variation 1284 201 15.65% 1.01% 95% Conversion Rate Limits From To Significant At 9.65% 12.45% 95% confidence: YES 13.98% 17.33% 99% confidence: YES 99% Conversion Rate Limits Z-score -3.4791822 From To 9.39% 12.72% P-value 0.00025 13.67% 17.64% Follow @ShameOnUX
- 21. Split Test 3 Goal: Increase click-through rate Conversion: Interest-based Type: Click Motivation: Interested in learning more about offer Follow @ShameOnUX
- 22. Split Test 2 Control Follow @ShameOnUX
- 23. Split Test 3 Scenario: Data supports that visitors who first visit the product detail page prior to entering the checkout are 50% more likely to complete their purchase Variation 1: Remove Buy Now Option Element: Button Follow @ShameOnUX
- 25. Split Test 3, Variation 1 Test Results Conversion Decrease: 18% Visitors Conversions Conversion Rate Standard Error Control 10112 543 5.37% 0.22% Variation 11213 511 4.56% 0.20% 95% Conversion Rate Limits From To Significant At 5.00% 5.74% 95% confidence: YES 4.23% 4.88% 99% confidence: YES 99% Conversion Rate Limits Z-score 2.72335304 From To 4.93% 5.81% P-value 0.99677 4.17% 4.94% Follow @ShameOnUX
- 26. Split Testing Key Takeaways • Don’t Guess. Test. • If at First you don’t succeed, test again. If at first you do succeed, test again. • Remove emotion from testing • Tests will fail • Tests will succeed • Put yourself in the shoes of your users; feel their pain, now design a test Follow @ShameOnUX