Hello,

I am trying to use the regress function in matlab to obtain residuals (i.e. rx) to use in a partial correlation coefficient. The thing is that the two parameters I am correlating are two sets of circular data (angle 0 to 360). It seems as if the regress function just gives residuals of linear data...is there a function to find residuals for circular data?

Thank you very much!
Cato

Cato wrote:
> Hello,
> 
> I am trying to use the regress function in matlab to obtain residuals (i.e. rx) to use in a partial correlation coefficient. The thing is that the two parameters I am correlating are two sets of circular data (angle 0 to 360). It seems as if the regress function just gives residuals of linear data...is there a function to find residuals for circular data?

This toolbox

<http://www.mathworks.com/matlabcentral/fileexchange/10676-circular-statistics-toolbox-directional-statistics>

is freely available on the MATLAB File Exchange.  I am not familiar enough with what you need to know if it provides what you are looking for, but it seems quite useful for circular data.  Hope this helps.