The concordance rate is a statistical measure describing the proportion of pairs of individuals sharing an attribute, given that one already possesses this trait. A pair is considered concordant if they both possess an attribute of interest and discordant if they differ. It is commonly used to estimate the influence of nature and nurture on the development of a particular attribute or disease in an individual.

Skiold-Hanlin, S. (n.d.). Concordance rate | Definition, calculation & interpretation. Study.com. Retrieved November 10, 2025, from https://study.com/learn/lesson/concordance-rate-concept-formula.html