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Parameters used as inputs to population modeling; not subject-level data. 

Models are made up of  inputs, programs/coding, and outputs

• inputs: come from specific studies, published lit, gov't databases (census data, etc)
  • everything has to be extrapolated to the population level; inputs are not subject-level
  • categories of inputs
    • Product risk
      • need input from Unknown User (a.paredes) . Come back to later, time permitting
    • transition probabilities/rates (behavior)
      • initial population (file) - describing states of tobacco use covered by the model
      • transition probability (file)
    • population attributes broken down by demographic characteristics (files)
      • birth rate 
      • morbidity/mortality 
      • initial tobacco prevalence
      • immigration rates 
• programs/coding
  • ...
• Outputs
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