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March 27 Non-experimental designs (surveys)

March 27 Non-experimental designs (surveys) -...

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March 27, 2008 Non-experimental Designs (surveys) Lecture Overview Causal Inference in non-experimental designs Typical non-experimental procedure Elaboration and statistical control Measurements errors (asking questions) Sampling errors Non-experimental designs: strengths and weaknesses Non-experimental designs Surveys and other non-experimental designs are typically used to explain or explore relationships between variables (correlational research) Such designs give researchers less control in terms of establishing temporal precedence and eliminating alternative explanations (random assignment and equivalent comparison groups are not feasible) Typical non-experimental procedure Sample many respondents who answer the same questions Measure many variables (including intervening or external variables) and test multiple hypotheses about relationships If possible, establish temporal order By asking retrospective questions
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