r function gls what function for seasonal correlation in r what program to use for generalized least squares model which package do i need to create a seasonal model of the model? what software program would fit a seasonal model what type of function is used to specify the correlation of a seasonal model? ________ is the function for fitting a gls what type of model do seasonal error follow which r package is best for seasonal models r functions what software can do correlation analysis in r why r is using the gls where are correlation structs stored in r what is the ggs function? r function corstruct why gls is needed for seasonal model can you fit a seasonal gls model what is the function for gls corstruct a r model what function does gls use how to fit a seasonal model