StatReason: Statistics Calculators That Explain Their Answers

Field notes

The homepage organizes 128 calculators into categories such as confidence intervals, regression, sample-size planning, reliability, and simulation. Its stated workflow puts the answer first, then separates computable results from assumptions that require review and explains what the result does not mean. The site also states that calculations run in the browser, that entered data is not uploaded or stored, and that no account is required.