creating categorical variables with biogeme

[manolisvergis]

Hi everyone,

Is there anyway to create a categorical variable using the 'DefineVariable" command;

thanks in advance,

[michel.b...@epfl.ch]

Yes. The difference between a variable defined by DefineVariable and by a regular statement is that it is pre-processed and calculated once for all. If you have a model that takes a while to estimate, it may save a significant amount of time. 

[manolisvergis]

[Bierlaire Michel]

Yes. Look at the definition of the variable CAR_AV_SP in this model

http://biogeme.epfl.ch/examples/swissmetro/python/01logit.py

It is 1 if the car is available and the value of SP is not 0, and 0 otherwise. 

Another example is the definition of the trip purpose in this model

http://biogeme.epfl.ch/examples/latent/python/03choiceOnly.py

PurpHWH = DefineVariable('PurpHWH', TripPurpose == 1)
PurpOther = DefineVariable('PurpOther', TripPurpose != 1)

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