why r squared is not appropriate for time series why is r squared not appropriate in time series why is r squared appropriate why is r squared used in time sequences why use r squared why is r squared inappropriate in time series why do i put an r squared in time series model why r squared is no longer appropriate why is it useful to use r squared why does time series need to be r squared why is r squared not appropriate for time series why use r squared in time series why is r squared used in time series why use r squared time series why are time series r squared what is the problem in r squared time series why use r squared in time series why use r squared in time series why use r squared model? why is time series r squared