March 17 - March 17, 2008 Research design and Causality o...

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March 17, 2008 Research design and Causality o Experiments True(classical) – the “gold standard” for testing causal hypothesis Quasi-experiments o Non-experimental designs Cross-sectional Longitudinal True (classical) experiments o Random assignment of study groups Experimental group (the group that gets the stimulus/intervention) Control group (the group that gets nothing) or is exposed to different treatment/intervention from experimental group o Pretest and posttest Must be able to have before/after measures to measure the effect of intervention Causality and true experimental designs o Association Random assignment to treatment and control groups assures that the only difference between 2 groups is the intervention/experimental stimulus Control group provides info on what would have happened without the intervention, ceteris paribus o Time order Pretest and posttests take care of this requirement o Non spurious relationships Random assignment eliminates many extraneous influences that can create spurious relationships o Mechanism Experimental designs cannot directly address this factor o Context in which change takes place
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March 17 - March 17, 2008 Research design and Causality o...

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