T-test on correlation coefficients from 2 samples

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Dinal Jayasekera 2019-7-1

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https://ww2.mathworks.cn/matlabcentral/answers/469769-t-test-on-correlation-coefficients-from-2-samples

编辑： dpb 2019-7-2

Hi all,

I have two 360x360 matrices from two different samples. I am trying to run a ttest on each entry in one matrix with the corresponding entry in the other matrix, so (1,2) with (1,2) and (4,3) with (4,3) for example. This is the code that I currently have:

for i=1:360
    for j=1:360
        
        [h_cm(i,j),p_cm(i,j)] = ttest2(cm(i,j),control(i,j));
                
    end
end

As you can see, I am using a for loop. However, the output tables for h_cm and p_cm are populated with NaNs. Can anyone see where I'm going wrong?

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Dinal Jayasekera 2019-7-2

Yes I do want to do an element by element comparison within a matrix. Is there another MATLAB function that might be better suited for this?

The data from each matrix has already been averaged from 5 data sets if that helps.

dpb 2019-7-2

编辑：dpb 2019-7-2

Well, you can't compute the test statistic without the underlying data -- you'll have to back up a step to the point before you did the averaging--or you could compute the t statistic from the sample means and standard deviations, but there's not a builtin ML function that does the computation that way; only from the population samples. So, you'll have to write it yourself altho it isn't at all a difficult calculation, just not pre-packaged solution.

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