March 25 Causal Inference

March 25 Causal Inference - March 25, 2008 Research Design...

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March 25, 2008 Different types of research designs vary in their ability to handle threats to the validity of causal inference Experimental designs can test causal hypothesis more rigorously than non-experimental designs Manipulation (create the independent variable—not just observe it) Clear temporal order Effective control for intervening (third) variables The logic of experimental designs Co-variation and temporal order are controlled through manipulation of conditions Elimination of alternative explanations is achieved through random assignment of subjects to either control or experimental group Treatment=0 Control Group Pretest Posttest Subjects Random Time 1 Time 2 Assignment (same time) (same time) Experimental Pretest Manipulation Posttest Group Treatment=1 ***Quiz Question*** You randomly assign subjects to the experimental or control group. Subjects in each group complete the same pretest measure of political knowledge (PK). The average PK score in the experimental
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March 25 Causal Inference - March 25, 2008 Research Design...

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