08 Quasiexperimental Design - 1 1 2 QUASI-EXPERIMENTAL...

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10/26/2016 1 QUASI-EXPERIMENTAL DESIGN Class 8 1 LECTURE OUTLINE Factorial Design review Quasi-Experimental designs One group Nonequivalent control group Single case (quasi)experiments Cross sectional & Longitudinal QUASI-EXPERIMENTAL DESIGNS Not quite an experiment, but still helpful QUASI-EXPERIMENTAL DESIGN Quasi-experiment Looks like an experiment Manipulation (IV) Measurement (DV) 3 4 5
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10/26/2016 2 Constrained by several factors Budget Time Context of the research (e.g. clinical environments) QUASI-EXPERIMENTAL DESIGN Characteristics of quasi-experiments 1. Low sample size (low n ) 2. 2. No random assignment to groups 3. 3. Inferring causality is difficult Too many alternative explanations remain Possible confounding variables in design Better than nothing! QUASI-EXPERIMENTAL DESIGN One-group designs Posttest Pretest-posttest Nonequivalent control group Posttest Pretest-posttest ONE-GROUP DESIGN 6 7 8
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10/26/2016 3
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