| URL | Notes |
|---|---|
| QuesGen | Sample size, confidence interval, posterior probability of disease |
| Xuru | Online Probability Distributions |
| Xuru | Regression Tools |
| UCLA SOCR | Distributions |
| MGH Biostatistics software | Some great calculators from Harvard |
| NCSU Independence Tests | Exact unconditional tests for 2 by 2 contingency tables |
| Vassar Confidence Interval | Confidence interval for a correlation |
| GLIMMPSE | Free software for power and sample size calculations |
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