Hi jannis, Thanks for replying I will try to make my question more clear. Actually I have many Hourly time series and I want to automatically detect whether seasonality is present in this series or not.If Yes, Then I need to find the period after which the seasonal pattern repeats. For this using everytime Autocorrelation(ACF) plot would become tiresome.SO I need some test which would examine presence of seasonality. Hewitt test is on option Which you suggested. What is SSA? I would read on FFT and see how to make use of FFT to detect seasonality..
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