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Seasonality refers to the recurring fluctuation around the mean of a time-series for a given period of time, usually a calendar year.

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Why strong seasonality in time series of total shipped volumes not observed in customer groups?

When the data is aggregated at month level for all the customers together it is easy to see the effect of quarterly and monthly seasonality. Higher volumes are seen in Q3 and to some extent in Q4. … What is a good explanation for having a clear seasonality in the total volumes shipped but not in the components? …
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