standard deviation of coordination in a ROI

[albert]

Hi everybody, I need to calculate the standard deviation of X and Y coordinations within a selected ROI; does anyone know how it can be done in imagej? or maybe i need to get the original plugin of standard deviation calculation in imagej and change it a little bit to adopt it for my need? Xav= sigma (X_i*I_i)/N {std (X)}^2= sigma (X_i*X_i-Xav*Xav)*I_i/N