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I've day level sales data. If I select let say all monday sales from this data. Can I make a time series of all Monday sales which can accurately predict the future. If I can, how reliable is that forecast?

Thanks in advance!

Lakshveer Singh
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    Could you explain what your "clubbing" operation is? This is not a standard English statistical term. – whuber Apr 05 '19 at 13:58

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Simple method of forecasting number of guests given current and historical data would be a good place to start. Daily data often contains deterministic and arima structure. I would not take each day by itself and build separate models as there is often an auto-dependency on previous days i.e. ARIMA structure. .

IrishStat
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