Free online Odds Ratio (OR) statistical calculator calculates Odds Ratio with 95% Confidence Interval from a 2x2 table. Odds Ratio Calculator Formula: r = (p1 * (1 - p2)) / (p2 * (1 - p1)); Where: p1: The probability of event in the experimental group p2: The probability of event in the. odds ratios are the measure of association in a case control study. This video demonstrates the calculation of.
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