POLS2009 Study Guide - Final Guide: Internal Validity, Treatment And Control Groups, Dependent And Independent Variables
14 Jun 2020
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Week 10: experiments: true experiments: rct : sometimes used to refer to any randomized experiment where the three characteristics are fulfilled. C: the response of individuals in treatmen group is compared to those in controlled group- Creation of counterfactual (control group) estimation of difference. R: random a: assignment of subject"s subject to treatment and control groups is done at random. M: there is manipulation of the treatment also known as the intervention is under the control of the experimental researcher: the treatment wasn"t given before you and you are doing the random assignment. The casual inferences is the strongest here- with rct -strong internal validity and assumption that both unobservable and observable characteristics will be the same. Cost and time constraints -bc you are manipulating and problems with external validity of random assignment. Eg: random assignment to policing of crime hot spots. Subjects: experimental sample of 1,919 hot spot street segments.
