How do I compare between 10 groups on a Ttest2?

Hello, I have 10 vectors. For each vector, I have to do a Ttest2 with the nine other vectors(nine comparisons for each vector). Any ideas how i can do this? Thanks!

Answer 1

[jgg]

Let's suppose you have them labeled v1, v2, ..., v10 and they're the same size n. (If they're not the same size, use a cell array instead.)

Put your vectors in an array:

 v = [v1,v2,v3,v4,v5,v6,v7,v8,v9,v10];

Then loop over them:

 v = randn(1000,10); %to debug; use the real v here
 h = zeros(10,10);
 p = zeros(10,10);

 for i = 1:10
    for j = (i+1):10

     [h(i,j),p(i,j)] = ttest2(v(:,i),v(:,j));

    end
 end

Your values and decisions for tests i,j are in the respective element of h and p.

Notice, you don't actually need to do 9 comparisons from each vector; if you've already compared v1 and v2 you don't need to compare v2 to v1 as well.