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the time series model (which doesn't have periodic component) can be decomposed to
Y = T + S + R
Y = T.S.R
Y = T.S + R
Y = T + S.R (T = trend, S = Seasonal, R = Random)
But forecast package gives only additive and multiplicative models but not the combination
I want to try all 4 combinations and take the best fit. How can I do it and compare ?