mccutchen ch10 fall 12
TRANSCRIPT
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CHAPTER 10
COMPLEX EXPERIMENTAL
DESIGNS
Dr. Rodica Ghinescu
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INCREASING THE NUMBER OF
LEVELS OF AN INDEPENDENT
VARIABLE
Provides more information about the
relationship than a two level designComparing Two or More Groups
I.E. How dogs, cats, and birds as opposed
to dogs alone have beneficial effects on
nursing home residents
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INCREASING THE NUMBER OF
INDEPENDENT VARIABLES:
FACTORIAL DESIGNS
Factorial Designs: Designs with more
than one independent variable (orfactor)
Simplest Factorial Design
2 x 2 factorial designHas two independent variables
No of levels of first IV x no levels of second
IV x No of levels of 3rd variable
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Examples of factorial designs
2 x 3 (two by three design) has two
independent variables; the first
independent variable has 2 levels; the
second independent variable has 3 levels
Can easily determine the number of
conditions in the experiment by multiplying
the number of levels in each factor
6conditions here
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2 x 2 factorial design
Gender (IV B) Obesity(IV A)
obese not obese
Overall means
(main effect of B)
Woman 13 41 27.0
Man 13 18 15.5
Overall means (maineffect of A)
13 29.5
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INCREASING THE NUMBER OF
INDEPENDENT VARIABLES:
FACTORIAL DESIGNS
Interpretation of Factorial Designs
Main effects of an independent variable arethe effects of each independent variable
while controlling for the effects of the other
independent variable(s)
Interaction between the independentvariables occurs when the influence of one
independent variable is different at different
levels of the other independent variable.
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INCREASING THE NUMBER OF
INDEPENDENT VARIABLES:
FACTORIAL DESIGNS
Interactions and Moderator Variables
Outcomes of a 2 x 2 Factorial Design1. There may or may not be a significant main effect for
independent variable A
2. There may or may not be a significant main effect forindependent variable B
3. There may or may not be a significant interaction between
the independent variables(See results in next five slides)
Interactions and Simple Main Effects Simple main effect of type of questioner
Simple main effect of type of question
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INCREASING THE NUMBER OF
VARIABLES: FACTORIAL
DESIGNS
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INCREASING THE NUMBER OF
INDEPENDENT VARIABLES:
FACTORIAL DESIGNS
Assignment Procedures and Factorial
Designs Independent groups design
Repeated measures design
Mixed factorial design using combinedassignment
C S G O
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INCREASING THE NUMBER OF
INDEPENDENT VARIABLES:
FACTORIAL DESIGNS
INCREASING THE NUMBER OF
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INCREASING THE NUMBER OF
INDEPENDENT VARIABLES:
FACTORIAL DESIGNS
INCREASING THE NUMBER OF
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INCREASING THE NUMBER OF
INDEPENDENT VARIABLES:
FACTORIAL DESIGNS