202_week_6_ppt - JS202 Research Design Methods and...

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Unformatted text preview: JS202: Research Design, Methods and Evaluation Experimental design Classical approach to a scientific experiment Considered the gold standard Few (if any) social science experiments take place in a laboratory setting Basic idea of randomized experiment Pool of research participants are assigned to two (or more) conditions randomly Uses a control group and an experiment group Tests before and after intervention (time 1 and time 2) Clinical trials are an example Experimental condition Measured on the DV, exposed to a Tx, measured again on the DV on the DV, not exposed to the experimental condition or Tx (or exposed to the regular Tx), measured again on the DV Control condition Measured Can randomize... Persons Households Classrooms Hospitals Neighborhoods Business enterprises but this is often impractical Assumptions... That participants are not affected by the assignment mechanism itself (sometimes just knowing that they have been `chosen' for Tx can impact the results) That the intervention for the experimental group has no effect on the control group Double blind experiment Removes the individual that is providing the Tx from the selection process The researcher doesn't know who is receiving the Tx and who is not Advantages of experimental design Meets the criteria for causality Control the stimulus and can control the cause and effect of the temporal dimension Can assess empirical correlation by comparing two groups Impact of external effects is minimized Threats to validity for experimental design History Maturation Testing Instrumentation Statistical regression Selection bias Experimental mortality Causal time order Diffusion or minimization of Tx Compensatory Tx Demoralization Quasi-experimental design Conducting experiments that almost conform to the rigors of experimental design Matched characteristics Before/after design Time serious design ...
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