how to find correlation coefficient ?

Question

pruth 2016-3-11

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评论： pruth 2016-3-17

matlab.mat

hello, I have a mat file, which has two columns. file attached.

I want to find a correlation coefficient between these two columns.and p-value also. and also want Plot the Pearson's linear correlation coefficients between these two.

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Muhammad Usman Saleem 2016-3-11

its is a binary file.

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Answer 1

Muhammad Usman Saleem 2016-3-11

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/272822-how-to-find-correlation-coefficient#answer_213255

Try from them

http://stackoverflow.com/questions/14342938/correlation-between-two-vectors

http://www.mathworks.com/help/matlab/ref/corrcoef.html

http://www.mathworks.com/help/images/ref/corr2.html

http://www.mathworks.com/help/matlab/data_analysis/linear-correlation.html

https://www.quora.com/How-do-I-get-one-correlation-coefficient-or-r-value-in-MatLab

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Muhammad Usman Saleem 2016-3-16

编辑：Muhammad Usman Saleem 2016-3-16

在 MATLAB Online 中打开

because you have not define a variable before

See this

a=[1 2 3;4 5 6] % creating a matrix
a =
       1     2     3
       4     5     6
A= a(:,2); % means all rows with second column of a matrix
B = a(:,3); % means all rows with third column of matrix
[R,P] = corrcoef(A,B) %cross correlation 
R =  % 1 showing good correl
       1     1  
       1     1
P =   %depends upon your data set NaN means no corr   
       1   NaN  
     NaN     1