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STARTING VALUES FOR PARAMETERS

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• All NLS algorithms need
  
  
  • Some codes have option to pick for user
    
    
• Good starting values can make BIG difference
  
  
  • Values often available from other analysis
    
    
  • Otherwise obtain by
    • Search algorithms
    • Linearization of model
    • Graphical analysis
    • Experimentation

Ref: Himmelblau (1970)
         Process Analysis by Statistical Methods,
         John Wiley and Sons.