CRM 2303 Lecture Notes - Lecture 15: Ottawa Police Service, Random Assignment, Internal Validity
1 May 2016
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Document Summary
Advantages of lab experiments maximal manipulative control over the experimental situation. But, the lab is hierarchal, controlled, artificial, has weak external validity. Used to make causal inferences when you are unable to: Manipulate the iv randomly select and assign control and treatment groups conduct a pre-test. Move from manipulative control to analytic control. Quasi-experiment allows us to address concerns regarding ecological validity in lab experiments. Rival plausible explanations are dealt with by exerting analytic control. 2: systematically generate, and find the data to test, all rival plausible explanations. There are no easy fixes to internal validity threats. You have to think your way through the criteria for causation using analytic control. Refers to our ability as researchers to take an existing situation and, through the application of analytic powers, try to make sense of the causal patterns that exist. Types of quasi-experimental designs: nonequivalent control group designs, before-and-after or repeated measures designs, nonequivalent control group design.
