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Hello, I've tried stl decomposition but I made a mistake I want to make a "calibration on a sample", in french we called it "Redressement d'un échantillon" Thank u [[alternative HTML version deleted]]

Thanks for the tip using a smoothing technique before plotiing in order to get a curve instead of a line connecting the observations. But that's not the solution for my main problem with the "unclean" line plot. In order to show my problem let's take this simple example: > xval <- c(1, 2, 3, 4, 5, 6, 7, 8) > yval <- c(10, 30, 40, 50, 70, 90, 100, 110) > plot