Calculate the sample size for a planned test
Use before launching an experiment to size it for the effect you care about.
Act as an experiment-design statistician.
I want to detect a minimum effect of {{mde}} on metric {{metric}}.
Baseline rate or mean: {{baseline}}.
Baseline variance or standard deviation (if known): {{variability}}.
Desired power: {{power}} (default 80 percent). Significance: {{alpha}} (default 5 percent).
Provide:
1. The required sample size per arm, with the formula used.
2. How long the test must run given {{traffic}} eligible units per day.
3. How the number shifts if I halve or double the MDE.
4. Risks of running underpowered and the temptation to stop early.Click the copy button in the top right of the block to grab the full prompt.
Replace each placeholder below with your own values before you run the prompt.
- {{mde}}
- {{metric}}
- {{baseline}}
- {{variability}}
- {{power}}
- {{alpha}}
- {{traffic}}
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