Data input for 2x2x2 repeated measures ANOVA

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Data input for 2x2x2 repeated measures ANOVA

Postby Ted_Candle » Sun May 15, 2016 1:09 pm


I have some data (n=7, but n=1 shown below) derived from a 2x2x2 repeated measures experimental design. I have 3 IV's, each with 2 levels, and one dependent variable measured in miliseconds. I am interested in the effect of shape, colour, and angle of an image on participant reaction time.

IV1 = shape [circle, square]
IV2 = colour [black, white]
IV3 = angle [90, 180]

DV = reaction time [measured in miliseconds].

Using SPSS, I want to test all 3 main effects (shape/colour/angle), the 3 interactions (shape x colour, shape x angle, colour x angle) and the 3 way interaction (shape x colour x angle). I assume I need to run a Repeated Measures 3-way (2x2x2) ANOVA on this dataset, but I am having trouble figuring out how to properly organise the data in SPSS.

Here is what my data looks like in excel (1 participant shown).

circle_black_90 circle_black_180 circle_white_90 circle_white_180 square_black_90 square_black_180 square_white_90 square_white_180
0.91 0.94 0.98 0.87 0.87 0.78 0.62 0.84

Currently, If I enter my data as they are into SPSS, then go to Analyze>GLM>Repeated Measures. I can define my 3 factors (2 levels each), but then the next step which involved assigning the factors to columns is confusing me e.g. How can i assign factor 'colour' to 2 columns when the factor's levels exist across 4 columns. Or am I making a fundamental error here?

Any help is apprecaited, I cannot find much help specifically in terms of data input for 3 way designs.


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