Difference between experimental and quasi experimental research
Answers
Experimental is another word to describe (prospective) randomized controlled trials. The main ingredients of an experimental condition will always be randomization and obviously then, a control group(s) with the exact same probability of receiving the intervention as receiving the control condition.
Quasi-experiments are also called non-randomized studies, observational studies, etc. Here, the main ingredient is that (a) the study is almost always performed retrospectively, and (b) you can adjust the data to "mimic" a randomized trial (using observed data only). The most popular approach is matching, where a control group is found among the non-treated population who have the same observed baseline characteristics as the treated group. Therefore, the groups are comparable, and thus outcomes may be "assumed" unbiased (we assume unbiasness because we never can control for unmeasured variables, which may confound the relationship between the treatment and outcomes)...
That was the short answer :-)
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