Lecture 24 - Quasi-Experimental Design

Lecture 24 - Quasi-Experimental Design - Psych 301W Lecture...

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Psych 301W – Lecture 24 Fall 09 - Wede Lecture 24 – Quasi-Experimental Design Quasi-experimental research designs Used to make comparisons among different groups of individuals who cannot be randomly assigned to the groups Quasi-experimental Designs Independent variable or variables are measured, rather than manipulated Correlational, not experimental Some similarity to experimental research as the independent variable involves a grouping Single-Group Designs Comparison-Group Designs Selection threats Occur because individuals select themselves into groups, rather than being randomly assigned to groups Before-After Designs Retesting threats Participants may be able to guess the research hypothesis They may respond differently to the second set of measures than they otherwise would have Attrition or mortality Occurs when participants drop out of the study and do not complete the second measure Participants who stay with the program may be different from those who drop out 1
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This note was uploaded on 09/23/2010 for the course STAT 100 at Pennsylvania State University, University Park.

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Lecture 24 - Quasi-Experimental Design - Psych 301W Lecture...

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