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Propensity is defined as a natural tendency. An example of propensity is an inborn love for writing. pl. -Â·ties. 1  a natural inclination or tendency; bent.  Obs. favorable inclination; bias (for)
A propensity score is the probability of a unit (e.g., person, classroom, school) being assigned to a particular treatment given a set of observed covariates. Propensity scores are used to reduce selection bias by equating groups based on these covariates.