Plot best-fit Spearman rank correlation curve

Dear Matlab community,

I'm evaluating one-variable Spearman rank correlation, simply by invoking:

[rho, pval] = corr(x, y, 'type', 'Spearman');

which works all fine. However, I now thought I'd like to plot my points as a scatter plot, overlaid with the rank correlation best-fit that gives the rho and pval from above. I.e:

plot(x,y,'o')

and then a line representing the Spearman rank best-fit. However I seem to fail in understanding how to get this line or equation.

It might be a newbie statistics question, but does anyone know how I could get this line?

Thanks

Answer 1

[Anwar S]

Please check the function:

corrplot

Answer 2

[Jeff Miller]

Tricky question, because the whole point of the Spearman correlation is that the x/y relationship might be nonlinear. Maybe use loess? You might find the discussion here helpful.