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
JSCalc
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
Odds Ratio Calculator for 2×2 Tables
If you’ve read political polling reports or articles on health studies, or been subjected to tech company’s A/B tests, then you know what an odds … Read More
Omega Squared Calculator for ANOVA Effect Size
ANOVA is done: You run the test and get a significant F statistic. Your peers are impressed, the p-value is tiny, and yet… does it … Read More