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## RMAOV2

version 1.0.0.0 (4.27 KB) by Antonio Trujillo-Ortiz

### Antonio Trujillo-Ortiz (view profile)

Repeated measures two-way analysis of variance test.

Updated 03 Aug 2004

ANOVA with two within-subject variables is used to analyze the relationship between two independent variables and the dependent variable. This procedure requires fewer participants but can give rise to research confounds such as order or practice effects and participant bias.

For a more detailed explanation on repeated measures designs, we suggest you read the help section of the RMAOV1 file you can find on this MATLAB File Exchange site.

It needs to input the X- data matrix (Size of matrix must be n-by-4;dependent variable=column 1;independent variable 1=column 2;independent variable 2=column 3;subject=column 4) and the alpha-significance level (default = 0.05).

The output is a complete Analysis of Variance table and the strength of the relationships.

Daniel

### Daniel (view profile)

The function has an output argument, but nothing is assigned to it.

How can we add the fdr correction on this statistic??

Thanks

Olaf Dimigen

### Olaf Dimigen (view profile)

Warning. This function (and apparently all other ANOVA functions by this author) produces a wrong output if (A) one of the factors has more than 10 levels and more than 10 subjects are used or (B) both factors have more than 10 levels.
The reason is that the "eval()" function is used to create temporary storage variables. Unfortunately, "factorlevel 1" and "subject 11" and "factorlevel 11" and "subject 1" are written into the same storage variable with the concatenated name "x111", that is, the value of this variable is accidentally overwritten. This produces wrong results and also explains the negative F-values reported above.

Olaf Dimigen

Dominik Bach

### Dominik Bach (view profile)

- I encountered negative SS values, and consequently negative Fs
- the output differed from SPSS output both with SS model II and III, and from rm_anova2.m that uses SS model III and gives the same results as SPSS

Michael Hamman

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Best Wishes.

Mike

Ji Cling

Shame on you.

Arturo Ramírez

Patrick Craston

Thanks for great code!

Richard Born

Works for me. However, unlike the toolbox function, anovan, the grouping variables must be consecutive integers, 1:n. This will be fixed by:

function [Gred] = facred(G)

% G is the orginal matrix of grouping variables:
% each row for is an observation; each column is a different grouping variable.
Gred = G;
for k = 1:size(G,2)
groups = sort(unique(G(:,k)));

for m = 1:length(groups)
t = find(G(:,k) == groups(m));
Gred(t,k) = m;
end
end

J. D.

Good code.

L. G.

My friends think this is great and told me to download it.