Repeated measures ANOVA in built-in function?

I have 3 groups evaluated in 4 moments. Each group has a different sample size: a classic data structure evaluated by a RM-ANOVA.

I couldn't figure out how to evaluate this design using built-in functions.

Anybody has it solved?

Thanks

my dataset:

   a=[94.1829   93.8598   81.1412   81.2108;
   81.6985   69.6780   44.7825   23.8922;
   95.5090   88.9877   64.6163   36.7676;
  109.4927   86.5919   76.8675   69.9050;
  107.1744   83.7629   64.5236   54.6105;
  122.8783  118.6863  111.8991   96.8327;
  101.6673   82.9159   66.3047   44.2722;
   78.4351   54.4806   25.3277   10.1075;
  116.8940  103.6841   92.1165   78.1461;
  112.8228   86.5890   79.5943   74.4225;];

b=[102.2261   93.0851   78.9204   65.7865;
107.7945   92.0265   71.6536   47.8251;
103.8471   94.9030   66.6462   53.9623;
106.9637  104.1126   96.5721  101.6324;
 98.8728   88.2883   79.6579   68.3273;
 99.6118   92.2495   91.5766   85.4978;
100.8809   97.5272   74.4073   69.8478;
 92.1034   67.3932   61.1477   56.3396;
114.2296  105.0169  102.7492  104.5469;];

c=[106.8648  102.8265   87.7277   88.5718;
 91.4507   78.8077   64.6443   61.2939;
 89.2476   66.4214   69.4772   61.3044;
 99.0903   64.7980   53.4582   44.7148;
 97.4723   87.4366   75.2352   70.3918;
111.9482  112.8508  116.7733  111.2994;
106.0606   91.0268   86.2848   78.9479;
105.4051  111.6042  108.6534   97.0706;];

Answer 1

[Tom Lane]

There's not a repeated measures anova function in the Statistics Toolbox. You may find something on the File Exchange.

There are various ways you can approach this. You could concatenate the data into a single matrix, and create a grouping variable:

y = [a;b;c];
g = [ones(size(a,1),1); 2*ones(size(b,1),1); 3*ones(size(c,1),1)];

Then you could try the manova1 function.

[Adam Danz]

Update: Now there's a repeated measures ANOVA function.

https://www.mathworks.com/help/stats/repeatedmeasuresmodel.ranova.html