2-way-anova with balance over subjects

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jasony
jasony el 29 de Nov. de 2020
Comentada: Jeff Miller el 30 de Nov. de 2020
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

Respuesta aceptada

Jeff Miller
Jeff Miller el 29 de Nov. de 2020
Look here for an explanation of how to do a repeated measures ANOVA with the same 2x2 within-Ss structure.
  6 comentarios
jasony
jasony el 30 de Nov. de 2020
Thank you very much for your help.
True, I think I have to use linear mixed models here - I think this is also why I didnt get any further with the ANOVA at this point. I gonna do it like you say and for now average over the 4 conditions within the subjects and do a 2x2 ANOVA.
Than I gonna go for a second step and try it with linear mixed models. That all helped me a lot, thank you very much for your effort, I realy apprciate it :)
Best
Johannes
Jeff Miller
Jeff Miller el 30 de Nov. de 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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