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LOESS (or LOWESS) stands for locally weighted scatterplot smoothing. It is a form of local (k-nearest neighbor) kernel regression

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Difference between LOESS and LOWESS

lowess and loess are algorithms and software programs created by William Cleveland. lowess is for adding a smooth curve to a scatterplot, i.e., for univariate smoothing. loess is for fitting a smooth surface … The SAS PROC LOESS provides an implementation of loess with the additional ability to estimate the span by minimizing the AICC criterion. …
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