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HSS Research Methodologies: Quasi-experimental Design

Definition | Quasi-experimental Design

A quasi-experimental design is one that looks a bit like an experimental design but lacks the key ingredient -- random assignment. With respect to internal validity, they often appear to be inferior to randomised experiments. But there is something compelling about these designs; taken as a group, they are easily more frequently implemented than their randomised cousins. See Research Methods Knowledge Base (2006)

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