Method
κ = (observed agreement − expected agreement)/(1 − expected agreement).
Cohen’s kappa
Estimate binary-rater agreement corrected for chance agreement.
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Inputs
Change assumptions
How to use it
Use the result as a transparent planning estimate. Change one assumption at a time, compare scenarios and move to Toolkit when you need system-level simulation.
Limits
Kappa is sensitive to prevalence and marginal bias; inspect the table too.
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Local by design
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