For the flu forecasting challenge (https://scicast.org/flu) participants are required to predict several flu season characteristics, at national and at regional levels (10 HHS regions). For some of the required quantities — such as peak percentage influenza-like illness (ILI), and total seasonal ILI count — one may argue that national level values have some relationship with the regional level ones. Or, in other words participants may be led to believe that national level statistics can be obtained from regional level ones.
US Flu Forecast: Exploring links between national and regional level seasonal characteristics
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