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Direct linkLee, Myoung-jae – Sociological Methods & Research, 2016
With one treated and one untreated periods, difference in differences (DD) requires the untreated response changes to be the same across the treatment and control groups, if the treatment were withheld contrary to the fact. A natural way to check the condition is to backtrack one period and examine the response changes in two pretreatment periods.…
Descriptors: Least Squares Statistics, Control Groups, Generalization, Models
