Bias Factor Calculator
Compute bias factors for unmeasured confounding
Input Parameters
Enter confounder prevalences and effect sizes
The observed association before adjustment
Prevalence of confounder among exposed (0-1)
Prevalence of confounder among unexposed (0-1)
Effect of confounder on outcome
Enter parameters and click calculate to see results
Formula
BF = [p₁(RR_CD - 1) + 1] / [p₀(RR_CD - 1) + 1]
Adjusted RR = Observed RR / BF
Where p₁ and p₀ are confounder prevalences in exposed and unexposed groups.
Learn More About Bias Factors
Bias factors quantify how much an unmeasured confounder could distort the observed association. Learn about confounding bias analysis in our course.