A/B Test Sample Size Calculator
When you test something and you notice a slight increase in conversions after 3 days when you launch a new checkout page, you’ll feel relieved. … Read More
JSCalc
Minimum Detectable Effect Calculator
So first: all experiments start with a question about capability rather then outcome. Before you run the test, you want to know what the design … Read More
Sample Size With Finite Population Calculator
Sample size isn’t something that’s written down in some book. It isn’t a static value. Instead, there is an appropriate number for you based off … Read More
Sample Size for Comparing Two Proportions Calculator
I have a hunch my new web design is doing better then the old one. I feel that my new email subject lines are cutting … Read More
Sample Size for Comparing Two Means Calculator
The hypothesis is that your new teaching method boosts test scores. Time to prove it! You’re ready with the data, enthusiasm, and determination. You probably … Read More
Sample Size for a Proportion Calculator
Your hypothesis begins as a guess. Perhaps you believe your customers is less happy. Maybe you think a new product feature are more popular then … Read More
Number Needed to Treat Calculator – NNT, NNH and ARR
On paper, these relative risk reductions look pretty good. You see a 30% reduction in heart attacks, and it seems like an advance; it’s something … Read More
Absolute Risk Reduction Calculator
A headline saying a new drug halves heart attack risk sounds like a breakthrough. We feels excited. But what if the risk was two in … Read More
Relative Risk Reduction Calculator with CI
“New drug reduces heart attack risk by 50%.” You stop scrolling because it’s a miracle. It is headline that sounds too good to be true. … Read More
Risk Ratio Calculator: RR, Risk Difference & CI
But what you’re seeing is a two by two table, and it looks uncomplicated. On one side are those who lived close to factory or … Read More