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Seasonal Unit Roots - Background Information

Sat, 06 Jul 2019 15:01:44 GMT

A recent email query about the language that we use in the context of non-stationary seasonal data, and how we should respond to the presence of "seasonal nit roots", suggested to me that a short background post about some of this might be in order. To get the most from what follows, I suggest that you take a quick look at this earlier post of mine - especially to make sure that you understand the distinction between "deterministic" seasonality" and "stochastic seasonality" in...