Repeated Measures ANOVA

Single factor repeated measures ANOVA for one or more samples.

Description

[p, table] = anova_rm(X, displayopt) performs a repeated measures ANOVA for comparing the means of two or more columns (time) in one or more samples(groups). Unbalanced samples (i.e. different number of subjects per group) is supported though the number of columns (followups) should be the same.

Acknowledgements

This file inspired Intraclass Correlation Coefficient (Icc).

• Required Products: Statistics Toolbox
• MATLAB release: MATLAB 7.4 (R2007a)

[Marc]

Hi,

I keep getting an errors when I run your file.

??? patients =
|
Error: Expression or statement is incomplete or incorrect.

Any suggestions on troubleshooting?

[ted teng]

 

[Andrew]

Does anyone know what the subjects matching output is? I'm assuming it shows the probably that subjects are the same, but just want to make sure

[Arash Salarian]

@Justin: I'm struggling with the comment editor. A previous comment was magically deleted and the other one does not make much sense now. In short, I verified the code and I think it is fine. Also, I run the same data through R and got identical results. You can see the R output here: http://imgur.com/FHJc4.png

[Arash Salarian]

Ah, I messed up the R output in my comment. Here is a link to a picture of the R output: http://imgur.com/FHJc4

[Justin]

thanks,
One problem that I noticed is that in your example, you show that time is the within subjects factor, but in your reality you seem to treat the group as the within subjects factor.

the f-value that you get for time seems to come from dividing MStime by MSerror. This should really be MStime / MSsubjects if this is the variable with repeated measures. You also get the f value for group by MSgroup / MSsubjects. The group variable should not have repeated measures, so basically, the two should be reversed. I'm not sure, but I think that the error is consistent with itself int he rest of your code, so In order to get the correct results from this function you need to switch the organize your two factors opposite of the way that the you did it in the example.

statizticz is 3vil

[Ali Ali]

Thanks a lot

[Chris Allen]

Nice clear function, be even better if it could handel more factors (like anovan)

[Sophie]

Dear Arash, First thank you for this really useful function. Please, would you mind telling us, what does this "Subject matching" correspond to exactly (in the resulting table)?
Thanks a lot.