PSY 250 Chapter Notes - Chapter 13: Quasi, Interrupted Time Series
4 Nov 2016
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Chapter 13: the nuts and bolts of quasi-experiments. Different aspects of a quasi-experiment from other designs. Quasi-experiment doesn"t contain a iv quasi-independent/subject variable. No strong causal info because of the lack of random assignment. How to deal with alternative explanations: include a control group. Nonequivalent group: groups compared in a study where participants are not randomly assigned. Compared between the control and exp group with scores. Regression toward the mean: tendency for scores to average out. A variable is extreme on its first measurement, it will tend to be closer to the average on its second measurement. Include 2 pretests reduce extraneous effects, clarify the comparison between the control and experiment group. Have both groups to be the experimental and control groups in alternating order control group differences. Event that occur during the course of a study to all participants bias. Measure the behavior multiples times before and after the treatment for the same length of time.
