Return a pattern \(F_S(t)\) to model seasonality with the form $$S(t) = c \left(1+\epsilon + \sin\left(\frac{2 \pi (t-\tau(t))}{P}\right)\right)^q$$
Return a pattern \(F_S(t)\) to model seasonality with the form $$S(t) = c \left(1+\epsilon + \sin\left(\frac{2 \pi (t-\tau(t))}{P}\right)\right)^q$$