Biostat Equations PDF
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Summary
This document provides common biostatistics equations, useful for understanding and calculating various statistical measures in biomedical research. The equations cover concepts such as power, risk, relative risk, and more. It's a resource for students and researchers working in the field.
Full Transcript
# Common Biostatistics Equations - **Power** = 1 - β - **Risk** = # of subjects with the unfavorable event in one arm of the study / Total # of subjects in that arm of the study - **Relative Risk (RR)** = Risk in the treatment group / Risk in the control group - **Relative Risk Reduction** = 1 - Re...
# Common Biostatistics Equations - **Power** = 1 - β - **Risk** = # of subjects with the unfavorable event in one arm of the study / Total # of subjects in that arm of the study - **Relative Risk (RR)** = Risk in the treatment group / Risk in the control group - **Relative Risk Reduction** = 1 - Relative Risk - **Absolute Risk Reduction** = (% risk in the control group) - (% risk in the treatment group) - **Number Needed to Treat** = 1 / (risk in control group - risk in treatment group) *known as absolute risk reduction* * Always round up for NNT - **Number Needed to Harm** = 1 / (risk in control group - risk in treatment group) *known as absolute risk increase* * Always round down for NNH - **Hazard Ratio** = Hazard rate in the treatment group / Hazard rate in the control group - **Odds Ratio** = Odds of exposure among cases / Odds of exposure among controls *also expressed as: a/b c/d*
