1. S

    Error with "lowess" function in R

    I have a problem with lowess function to smooth time series NDVI (8-day image from apr to oct in Julian day) as a function of time by polynomial regression in R. Here is the scripts I run: #Create a time vector to act as x time<-sort(sample(97:297, nlayers(ndvi2000crop1)))...
  2. P

    evaluating loess fit

    Hello Everyone, I am trying to evaluate the fits of data using loess() in R. I cannot seem to find any established methods for determining the quality of a loess fit. I have been using the median absolute deviation of the residuals as an estimate of the "goodness of fit" and the amount of...