2-way-anova with balance over subjects
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I have a 2x2 design measuring 50 subjects reactiontimes in congruant and incongruant conditions, using 2 different devices (joystick, responsepad).
My main effect is within devices (congruant trials should be faster than incongruant trials), my interaction effect is between devices(In the joystick-setup the effect should be more pronounced than for the Responsepad). I want to balance over subjects (since some subjects might be naturally slower or faster than others) and over the stimulus set (each subjects sees the same stimuli and I want to account for some stimuli being more difficult to react to).
Each row of my datatable would therefor look roughly like this:
SubjectNr StimulusNr Device Congruant/Incongruant Reactiontime
1 1 1 1 0.9213
1 2 2 1 0.4123
1 3 1 2 0.3123
1 4 2 2 0,5123
2 1 ... ... ...
The first 4 rows are obviously categorical variables.
After reading the anova, ranova and fitrm in Matlab several times I still struggle how to implement my analysis. Im thankfull for any help
Best Jo
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Jeff Miller
il 29 Nov 2020
Look here for an explanation of how to do a repeated measures ANOVA with the same 2x2 within-Ss structure.
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Jeff Miller
il 30 Nov 2020
You are welcome. Good luck with your research.
If you get around to looking at delta plots (as some people do with congruence effects), you might find some of the routines in RawRT useful.
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