factorial2 - 031:010 - Research Methods in Psychology...

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031:010 - Research Methods in Psychology Spring, 2010 Apr 8 th 1
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One-way or Factorial? What determines whether an experiment should have more than one factor? ans: the theory (or theories) being tested e.g.: “responsibility is diffused across all witnesses” one factor: number of additional witnesses e.g.: “responsibility is diffused across all witnesses who are members of the same social group” two factors: number of additional witnesses same vs different social group 2
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Factorial Designs experiments often have more than one factor each factor can be within or between subjects each between-subject factor can be based upon a manipulated IV ( true ) or a measured SV ( quasi ) each between-subject manipulated IV must have a method of assigning subjects to groups each within-subject factor must have a method of setting the order of conditions 3
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Outline Within- vs Between-Subjects ( revisited ) Quasi- vsTrue Experiment ( revisited ) Random Assignment and Counterbalancing ( revisited ) 4
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Types of Factorial Design Between-subjects factor -
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This note was uploaded on 04/29/2010 for the course PSYCH 002 taught by Professor Freeman during the Spring '08 term at University of Iowa.

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factorial2 - 031:010 - Research Methods in Psychology...

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