Relative Risk And Risk Difference Calculator
Relative Risk And Risk Difference: a planned Super Calculator tool. Covers 2 by 2 exposure by outcome counts and confidence level (%). Stub page. Not published.
Relative Risk And Risk Difference Calculator is a planned calculator in the mathematics section of Super Calculator, covering statistics and probability.
What this calculator will compute
Inputs: 2 by 2 exposure by outcome counts and confidence level (%).
Outputs: relative risk, risk difference, confidence intervals, absolute risk per group and number needed to treat.
Formula, recorded as scope and not yet verified against a primary source: RR = (a/(a+b)) / (c/(c+d)). Confidence interval on the log scale: exp(ln(RR) plus or minus z * sqrt(1/a - 1/(a+b) + 1/c - 1/(c+d))). Risk difference = a/(a+b) - c/(c+d), whose reciprocal is the number needed to treat.
Status
This page is a stub. The calculator is not built, no figure on this page has been verified against the authority that sets it, and nothing here should be used to make a decision. The page exists so that the site structure is complete and so that articles can link this concept on first mention.
The stub carries noindex, nofollow and is excluded from the sitemap.