Sorry to bother you.
My question is summarized: I want to use the synthetic data of a small network to examine the route choice model, and only route length (or travel time) is considered in the (dis)utility function (for data synthetization). However, when I only
consider route length (or adding alternative specific constant) for utility using Biogeme, the result is wrong (strange final log likelihood and very large alpha value in MNL model compared to the paper). Actually, I have tested some other networks, and same
issues appear. The detail of one example is as follows:
I am replicating the small example of MNL model in a paper "Impact of route choice set on route choice probabilities" to learn Biogeme for my own reseach problem.
(1) Based on the paper, I obtain the synthetic data with probit results, which obtained similar route probabilities to that in that paper.
(2) Then, I just adopted the (dis)utility function in Eq. (17) in that paper with only route length in Biogeme:
(3) However, the likelihood results look strange, and the calibrated alpha in MNL model is quite large (in that paper, alpha=-2.08).
Would you give me some suggestions about which step might be wrong? (how to calibrate route choice models using synthetic data considering only route length (or travel time))?
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