Explain non-experimental methods of research in social psychology.
1. Instrumental Variables Estimators
Instrumental variables (IV) estimators are a natural extension of experiments with two intermediate steps (provided by Imbens and Angrist 1994 and Angrist et al. 1996). First, in addition to random assignment to treatment, consider natural experiments or other plausibly exogenous (“instrumental”) variables that influence assignment to treatment. (Instruments must be independent of potential outcomes and not influence the outcome directly, only indirectly through assignment to treatment). Second, allow that the instrument only imperfectly predicts assignment _____ _________ ________ ________ __________ ____ __________ __________.
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