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Factorial Designs And You!

# Factorial Designs And You! -...

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Factorial Designs And You! A Funlecture   by Mike Wood Psyc 201W *Fun not guaranteed. Some conditions apply. No  purchase necessary. See WebCT for details

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Factorial designs Designs with 2 or more independent  variables (discrete) All possible combinations of levels are  included. Drunk driving study IV 1: cocaine (yes or no) IV 2: beer (yes or no) DV: number of traffic cones hit
2x2 Factorial Design DV is cones knocked over 1 8 8 25 5 Beers No  Beer No  cocaine 3 lines

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Graphing factorial results Use lines or bars. Lines are generally easier. Label everything DV on the abscissa One IV on the ordinate, one
0 5 10 15 20 25 30 no drugs drugs Number of traffic cones hit no beer beer

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Terminology Factorial designs  must include all  possible combinations of independent  variables. 2 x 2 = 2 IVs, each with 2 levels 3 x 3 = 2 IVs, each with 3 levels 2 x 2 x 3 = 3 IVs, one has 3 levels, the  other has 2
What to look for There are 2 basic things we want to  know about a factorial design. Main effects Does variable X have an effect, ignoring all  other variables? Does variable Y have an effect, ignoring all  other variables? Interactions

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Main effects Calculate the marginal means . 1 8 8 25 5 Beers No Beer No  cocaine 3 lines 9/2 =  4.5 33/2 =  16.5 9/2 =  4.5 33/2 =  16.5
1 8 8 25 5 Beers No Beer No  cocaine 3 lines 4.5 16.5 No  cocaine 3 lines 4.5 16.5 No Beer 5 Beers Squish the table!

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Factorial Designs And You! -...

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