So what can you change to improve a Model ‘s fit to data?

• Different deterrence functions

  • negative power
  • negative exponential

• Different sets of Constraints

  • unconstrained
  • origin constrained
  • destination constrained

• Different Methods of Calibration

  • change Beta to minimise sum of errors squared
  • change Beta to minimise sum of absolute errors
  • change Beta to obtain the same mean trip cost as the observed data
    (called Entropy Maximising in AGW)

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