Hello Marcel - Please excuse for delay in responding - in order to test for seasonality Forecast Studio fits different autoregressive models behind the scenes and picks the most appropriate one based on AIC. For weekly data (seasonality of 52) the AIC penalizes models having too many parameters and a non-seasonal model will be preferred. As I have mentioned before - if you have knowledge about the seasonal behavior of your data, you are better off including seasonal models in a custom repository (for example BESTS). Happy to continue this discussion with you directly. Thanks! Udo
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