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Re: 2D Pearson correlation coefficient [message #87386 is a reply to message #87385] Thu, 30 January 2014 07:08 Go to previous messageGo to previous message
Matthew Argall is currently offline  Matthew Argall
Messages: 286
Registered: October 2011
Senior Member
> I would like to ask if someone know a code to calculate a 2D Pearson correlation as:
>
> r^2=(Sum wi*(Mi-M)*(Oi-O))^2 /((Sum wi*(Mi-M)^2)*(Sum wi*(Oi-O)^2))
>
> IDL has C_Correlate and R_correlate but none of them include the wi factor.


As far as I know, IDL does not do weighted correlations. It would not take you long to compute it, though. Basically, all you would have to do is replace "Sum" with the Total() function in the above equation...

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