Hello , i have the following doubts about AB test. I hope to get answers
1.when test size is 100% flow ，there is no test duration，I want to know how long it will take to reach an experimental conclusion
2、i did a test, with duration lasting 1 hour，but there is no experimental conclusion，Is there a requirement for the minimum number of samples in the experimental group
3.I found that the data in the following figure were not significant at 95% confidence level by chi square test, but it tells me there is 97.7% win confidence variation B is winner, I want to know what our A/B test rules are
To answer your first question, the A/B test test result is deemed statistically significant when:
50 people have received each variation
The win probability is at least 90%
This ensures that a large enough sample size of recipients have seen the A/B test, and that the winning variation largely outperformed the other(s) for the chosen winning metric (which, for campaigns, is either open or click rate). Here is a visual to help the community understand the decision for statistical significance:
There is no A/B test results for the experiment with only an hour duration time because not enough customers received the email to determine statistical significance. The article on best practices for A/B testing has more information on audience size. Imagine you have a great idea for an email, you A/B test it, and, on the first day, the first 10 people who see the email click through and make a purchase. Over the course of a week, the next 2000 people don’t open your email. If you had ended the test after the first day, you would think that your email was great, even though a larger audience showed otherwise. By waiting until your results are statistically significant or until you have a good sample size of viewers, you’ll ensure that you know which email is truly better for your brand.
Under the win confidence, you’ll see whether or not the variation shown is statistically significant. If it is deemed significant, this means that the variation has a high win probability. For Klaviyo campaigns, this means the variation has a 90% chance or more of winning. In this case, a green tag saying Statistically significant will appear. On the other hand, if the variation is not statistically significant, you will see a gray tag saying Not statistically significant. Nothing will appear if the results are inconclusive. The article I linked above goes over in detail how Klaviyo determines statistical significance and there for how the win confidence is determined.
Hope this helps answer your questions! Thanks again for being part of the Klaviyo Community!
To answer your first question, the A/B test test result is deemed statistically significant when:
50 people have received each variation
The win probability is at least 90%
This ensures that a large enough sample size of recipients have seen the A/B test, and that the winning variation largely outperformed the other(s) for the chosen winning metric (which, for campaigns, is either open or click rate). Here is a visual to help the community understand the decision for statistical significance:
There is no A/B test results for the experiment with only an hour duration time because not enough customers received the email to determine statistical significance. The article on best practices for A/B testing has more information on audience size. Imagine you have a great idea for an email, you A/B test it, and, on the first day, the first 10 people who see the email click through and make a purchase. Over the course of a week, the next 2000 people don’t open your email. If you had ended the test after the first day, you would think that your email was great, even though a larger audience showed otherwise. By waiting until your results are statistically significant or until you have a good sample size of viewers, you’ll ensure that you know which email is truly better for your brand.
Under the win confidence, you’ll see whether or not the variation shown is statistically significant. If it is deemed significant, this means that the variation has a high win probability. For Klaviyo campaigns, this means the variation has a 90% chance or more of winning. In this case, a green tag saying Statistically significant will appear. On the other hand, if the variation is not statistically significant, you will see a gray tag saying Not statistically significant. Nothing will appear if the results are inconclusive. The article I linked above goes over in detail how Klaviyo determines statistical significance and there for how the win confidence is determined.
Hope this helps answer your questions! Thanks again for being part of the Klaviyo Community!
