Chapter 14_Quasi-experimental designs.ppt

Chapter 14_Quasi-experimental designs.ppt -...

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Quasi-experimental designs
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When the independent variable cannot be manipulated… ...but involves comparing naturally occurring groups of individuals Quasi-experimental designs Correlational Between subjects Comparison-group designs Participant-variable designs Within subjects Before-after designs Time series designs Single subject design
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Quasi-experimental designs Single-group design Measured after they had the experience of interest Descriptive No control group Confounding variables Individuals Physical and psychological abuse Drug use IV DV
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Quasi-experimental designs Comparison-group design A group equivalent to the group of interest on all characteristics except the experience of interest (IV) Confounding variables possible difference between the two groups other than the experience of interest Individuals 1 Physical and psychological abuse Drug use IV DV Individuals 2 No Physical and psychological abuse Drug use Difference? Difference?
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This note was uploaded on 02/26/2011 for the course PSYC 420 taught by Professor Staff during the Fall '08 term at Maryland.

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Chapter 14_Quasi-experimental designs.ppt -...

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