I smoothed my data with the Kernel Smoother / Local Smoother (Local Fit: Linear, Weight funtion: tricube). The next steps I perform are based on a template. And the next step would be to compute the derivatives of the LOWESS functions (Local Smoother / Kernel Smoother). However I just can save the predicted values for each observation into a new column and cannot save the formulas of each local fit. Therefore I can not compute the derivations.
Is there somebody who could give me some advise on how to best set this up?