how to find correlation coefficient?

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Anusha
Anusha on 18 Mar 2014
Answered: Jos (10584) on 18 Mar 2014
a=[ 1 3 4 5 6 7;4 5 6 7 2 1;2 3 4 5 6 7;]
now the a will be rearranged
b=[1 2 4 6 7 5;2 7 6 4 1 5;7 5 3 4 2 1]
how to find correlation coefficient and plot?
  3 Comments
Anusha
Anusha on 18 Mar 2014
plot the graph for correlation coefficient
Patrik Ek
Patrik Ek on 18 Mar 2014
Edited: Patrik Ek on 18 Mar 2014
Plot the graph of a number? I cannot see what you are talking about. The correlation coefficient of a two matrices are defiend as above
corrcoef = [autoCorrA,xCorrAB;xCorrBA,autoCorrB];
where every element is a number. Do you mean that you what the cross correlation sequence ( xcorr ), or do you even want the cross correlation matrix? These are not the same as the correlation coefficient. Also do you want help of finding out how to plot something and which functions to use to plot, like plot, plot3, surf, ..., or do you want help to calculate whatever you tries to plot? This needs to be clarified since more people will look at this later on and I need to be sure of what I answer.

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Answers (1)

Jos (10584)
Jos (10584) on 18 Mar 2014
a = a(:) % transform into vectors
b = b(:)
plot(a, b, 'b.')
xlabel('Value of a') ;
ylabel('Value of b') ;
lsline % LS regression line
[r,p] = corrcoef(a,b) ;
r = r(1,2)
p = p(1,2)

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