FRHD 3070 Lecture 12: Week 12 – Quasi_experimental Designs
19 Dec 2017
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Document Summary
Used when the control of true experiments cannot be achieved. Use only when true experimentation is not possible. One-group posttest only design: compare the responses of a number of individuals exposed to the same event. One-group pretest-posttest design: add a baseline measure to provide a basis for comparison. Nonequivalent control group design: separate control group introduced, not equivalent due to lack of random assignment, selection differences. Nonequivalent control group pretest-posttest design: an improvement on the nonequivalent control group design, addition of pre-test improved internal validity, can assess for differences prior to testing. Interrupted time series design: examines the dependent variable over an extended period of time, both before and after the iv is implemented. Control series design: improves interrupted time series design by finding an appropriate control group , involves finding a similar population that did not receive a particular manipulation. Longitudinal method: same group is observed at different times (as they age)
