How to do error analysis/find uncertainty for a Savitzky-Golay filter in Matlab

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I have put a dataset (x,y) through a Savitzky-Golay filter in Matlab and now I would like to find the uncertainty in x. I have an uncertainty in x pre-filter but not sure if this still stands after smoothing the data. Does anyone know how to do this analysis? Thanks. The Savitzky-Golay filter I used is smoothdata(y,"sgolay","SmoothingFactor",0.1,"Degree",20);

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