MATLAB function to perform an unbalanced anova

Hi everybody,

I'm trying to do an 2-way repeated measures ANOVA with uneven number of subjects in each group (more pre than post measurements). The number of data point is like this:

Pre-group 1 (n=22),   Post-group 1 (n = 22),
Pre-group 2 (n=22),   Post-group 2 (n=16), 
Pre-group 3 (n = 22), Post-group 3 (n = 13),
Pre-group 4 (n = 22), Post-group 4 (n = 18).

I have tried to use the function called rm_anova2 ( http://www.mathworks.com/matlabcentral/fileexchange/6874-two-way-repeated-measures-anova/content/rm_anova2.m ) but it doesn't work.

Does anyone know of a function that is able to perform this kind of analysis?

Best,

Eric

Answer 1

[Brendan Hamm]

You can do this with anovan.

[CN]

Can anovan account for variable data within the groups? Or can it only return values when the arrays are exactly matched?

[Brendan Hamm]

What do you mean by variable data within the groups?

[Amberle McKee]

Can anovan account for unbalanced data within groups; if you have different sample sizes in each group?