Dear Prof. Bierlaire,
BETA_TIME_PT = BETA_TIME_PT_REF * exp(BETA_TIME_PT_CL * CARLOVERS)
V0 = ASC_PT + \
BETA_TIME_PT * TimePT_scaled + \
BETA_WAITING_TIME * WaitingTimePT + \
BETA_COST_HWH * MarginalCostPT_scaled * PurpHWH +\
BETA_COST_OTHER * MarginalCostPT_scaled * PurpOther
In the documentation it is specified that the co-efficients of PT time vary with the latent variable "CARLOVERS". My question is that if the coefficient of PT time is estimated as negative, it will be interpreted that latent attitude of CARLOVERS decreases with the increase in travel time of PT?
Secondly, why did you choose to specify using exponent:
"exp(BETA_TIME_PT_CL * CARLOVERS) ?"
Can we add the coefficient of CARLOVERS directly in the utility equation of PT?
Like this: "Coefficient of CARLOVERS * CARLOVERS"
Is this specificiation fine?
I would appreciate a lot for your help