Question: Suppose you fit a ( linear or nonlinear ) trend regression to a monthly time series and discover that the R 2 is only 1

Suppose you fit a (linear or nonlinear) trend regression to a monthly time series and discover that the R2 is only 18 percent. The best conclusion is that
Multiple Choice
fitting a seasonal component could raise the R2.
there is no seasonality in the time series.
the overall trend is probably negative.
adding seasonal factors might make things worse.

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