Find Which rows/items have a positive correlation with another item

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Learning 2022-8-22

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https://ww2.mathworks.cn/matlabcentral/answers/1783630-find-which-rows-items-have-a-positive-correlation-with-another-item

编辑： Torsten 2022-8-23

Hi,

I have a dataset (see below, rows 2 to 6, items A to E). I want to find out which items have a positive correlation with row 3 (item B). The data for each item is contained in columns B to E. Time course for when a measurement was performed is contained in the first row. As you can see, for item B, at 0hrs, it is 0 but them it increases linearly as time goes on. I want to find other items that have this behaviour as item B increases with time.

Any idea on how to use Matlab code to find out which set of items have a positive correlation with item B with time?

Thank you.

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Torsten 2022-8-22

https://en.wikipedia.org/wiki/Pearson_correlation_coefficient

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Answer 1

Torsten 2022-8-22

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1783630-find-which-rows-items-have-a-positive-correlation-with-another-item#answer_1030780

编辑：Torsten 2022-8-23

在 MATLAB Online 中打开

format long
A = [1 2 0 4;0 2 3 4;0 1 2 3;1 3 4 2;0 0.5 1 1.5].';
R = corrcoef(A)
R = 5×5
   1.000000000000000   0.485714285714286   0.529150262212918  -0.377964473009227   0.529150262212918
   0.485714285714286   1.000000000000000   0.982707629823991   0.529150262212918   0.982707629823991
   0.529150262212918   0.982707629823991   1.000000000000000   0.400000000000000   1.000000000000000
  -0.377964473009227   0.529150262212918   0.400000000000000   1.000000000000000   0.400000000000000
   0.529150262212918   0.982707629823991   1.000000000000000   0.400000000000000   1.000000000000000