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New trend analysis

Posted: Wed 26. Jul 2017, 18:48
by johnpane
It seems the new trend analysis fits a quadratic function to the data. This seems like a good choice for short-to-medium-term trends. However, I am interested in looking at my VO2max across several years. A quadratic function does not have enough flexibility to reflet the cyclical pattern in this data. Is it possible to fit a more flexible form function (such as spline) or to give the user a choice of functional form?