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SAS: The PSMatch procedure, and macro OneToManyMTCH match observations based on a propensity score. [10] Stata: several commands implement propensity score matching, [11] including the user-written psmatch2. [12] Stata version 13 and later also offers the built-in command teffects psmatch. [13]
Originating from early statistical analysis in the fields of agriculture and medicine, the term "treatment" is now applied, more generally, to other fields of natural and social science, especially psychology, political science, and economics such as, for example, the evaluation of the impact of public policies.