I have the historic sales per month, and we have strong seasonality, but also and upward trend. I would like to use the FORECAST_ETS function, however, I don’t understand how to get the value of seasonality. For example I know every July and August we have a drop and then it gets higher on September. In this case the seasonality would be 12?
If I want something more exact can I use Python and then get the equation and plug in pigment?
For calculating a better seasonality number, alpha, beta and gamma, is there a way to get those numbers in Pigment, or I need to have another application, such as Python or R?
Thanks in advance!