analysis of fit to cosine wave
I am planning to analyze circadian rhythm data and can fit it to the Savitzky-Golan smoother with a cubic degree and local cosine weighting. This provides a visual with a confidence of fit. However, is there a way to statistically determine the quality of the fit to the cosine waveform? I have tried saving the smoother formula to the data table then launching the analysis using the upper and low...