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Thanks! Works like a charm.

Thanks Mr. Gareth! It works, however I was probably a bit unclear. I need to do this for every week of the year, the example in the quote was just to elaborate the statement of "We calculate the average cloudiness value for each week of the year in each city,and deseasonalize by subtracting eac...

Hi, normally I can solve my problems with answers from other topics, this time my problem is a bit too specific. I will try to be clear as possible. I quote from "Good day Sunshine: Stock returns and the Weather": 'We calculate the average cloudiness value for each week of the year in each...