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Day of Week Averages by Season for ICD-9 code 008 (Viral Enteritis), ER cases from the real data. Note that the day of week varies with season – e.g. for the period 11/30/06–2/28/07(green), most cases are on Sundays, whereas for the period 8/31/06–11/30/06, cases are spread evenly among Sunday, Monday, Wednesday and Friday.
