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Quasi-Experimental Designs Nonequivalent Comparison Groups

Classical experimental design relies on researcher's ability to control the settingManipulation of at least 1 Ind. variableRandom assignment of subjects to groupsRandom assignment of Ind. Variable to group(s)Exposure of experimental group to treatment in isolationThis not very practical in so

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Quasi-Experimental Designs Nonequivalent Comparison Groups

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    1. Quasi-Experimental Designs Nonequivalent Comparison Groups Chad Reed March 12, 2008

    2. Classical experimental design relies on researcher's ability to control the setting Manipulation of at least 1 Ind. variable Random assignment of subjects to groups Random assignment of Ind. Variable to group(s) Exposure of experimental group to treatment in isolation This not very practical in social research Introduction

    3. When all classic requirements can’t be met Quasi-Experimental Designs (QEDSs) will be used As many requirements will be used as possible, but other measures are adopted to offset threats to Internal Validity Key Component Groups are Not Randomly Assigned Step Away from the Classic Model

    4. Structured much like pretest-posttest experiments but lack the randomized designs How then are Participants Selected to Each Group? Self Selection Administrator Assignment Different treatments at different sites Nonequivalent Groups

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