A/B Buddy
Sample Size & Power Calculator
免費Offers In-App Purchases
1.1.0for iPhone, iPad and more
Age Rating
A/B Buddy 螢幕截圖
About A/B Buddy
If you're planning to run an experiment – either on the web or in real-life – it's critical to collect the right amount data so that you know the experiment results are scientifically valid.
A/B Buddy is a sample-size calculator that helps you design A/B experiments with a quick slide of a finger. It uses a power-analysis formula to tell you exactly how many subjects, or users, that you'll need in an experiment in order to detect a statistically significant difference between two groups. Because if you have too few users in the experiment, you'll never see any difference between "A" and "B"; if you have too many enrolled, the experiment will never end. A/B Buddy tells you exactly the right number.
How does it work? Let's say your current conversion rate is 10%, and you want to see if a proposed change from the design team can boost that number up to 12% – that is, a 20% lift in the conversion rate. Simply pop open A/B Buddy, set the Baseline conversion rate to 10%, and the Minimum Detectable Effect to 20%, and your answer is waiting for you at the top of the screen.
A/B Buddy includes a Share button, which links to a web page displaying your sample size calculation. Your numbers, however, remain 100% private – all the information is stored in the URL fragment, and is never transmitted to any servers.
By default, A/B Buddy uses the most common statistical thresholds: 5% for the significance level (false-positive rate), and 80% for the power level (ability to detect the Minimum Detectable Effect). Power users can adjust these values after unlocking the Pro Features in-app purchase. But most users will find the defaults adequate for their needs.
Questions? Suggestions? Ideas? Feedback is always welcome at emmiller@gmail.com
A/B Buddy is a sample-size calculator that helps you design A/B experiments with a quick slide of a finger. It uses a power-analysis formula to tell you exactly how many subjects, or users, that you'll need in an experiment in order to detect a statistically significant difference between two groups. Because if you have too few users in the experiment, you'll never see any difference between "A" and "B"; if you have too many enrolled, the experiment will never end. A/B Buddy tells you exactly the right number.
How does it work? Let's say your current conversion rate is 10%, and you want to see if a proposed change from the design team can boost that number up to 12% – that is, a 20% lift in the conversion rate. Simply pop open A/B Buddy, set the Baseline conversion rate to 10%, and the Minimum Detectable Effect to 20%, and your answer is waiting for you at the top of the screen.
A/B Buddy includes a Share button, which links to a web page displaying your sample size calculation. Your numbers, however, remain 100% private – all the information is stored in the URL fragment, and is never transmitted to any servers.
By default, A/B Buddy uses the most common statistical thresholds: 5% for the significance level (false-positive rate), and 80% for the power level (ability to detect the Minimum Detectable Effect). Power users can adjust these values after unlocking the Pro Features in-app purchase. But most users will find the defaults adequate for their needs.
Questions? Suggestions? Ideas? Feedback is always welcome at emmiller@gmail.com
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最新版本1.1.0更新日誌
Last updated on 2020年04月14日
歷史版本
• Full support for Dark Mode
• A/B Buddy now requires iOS 13 or later
• A/B Buddy now requires iOS 13 or later
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Version History
1.1.0
2020年04月14日
• Full support for Dark Mode
• A/B Buddy now requires iOS 13 or later
• A/B Buddy now requires iOS 13 or later
1.0.1
2019年01月21日
• NEW glossary of terms explaining what each number represents
• NEW allow Minimum Detectable Effects of up to 100% (previous limit was 50%)
• Fix a bug when copying the subject count
• NEW allow Minimum Detectable Effects of up to 100% (previous limit was 50%)
• Fix a bug when copying the subject count
1.0
2018年12月12日
A/B Buddy FAQ
點擊此處瞭解如何在受限國家或地區下載A/B Buddy。
以下為A/B Buddy的最低配置要求。
iPhone
須使用 iOS 13.0 或以上版本。
iPad
須使用 iPadOS 13.0 或以上版本。
iPod touch
須使用 iOS 13.0 或以上版本。
A/B Buddy支持英文
A/B Buddy包含應用內購買。 以下為A/B Buddy應用內購買價格清單。
Pro Features
HK$ 68.00
