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This question already has an answer here:

I am wondering if is there a way that we can mathematically or statistically identify seasonality in time series without the need to look at its plot?

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marked as duplicate by mkt, user158565, StatsStudent, kjetil b halvorsen, Corone Jun 19 at 9:18

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.