biogeme.sampling_of_alternatives.generate_model module

Generation of models estimated with samples of alternatives

author:

Michel Bierlaire

date:

Fri Sep 22 12:14:59 2023

class biogeme.sampling_of_alternatives.generate_model.GenerateModel(context)

Bases: object

Class in charge of generating the biogeme expression for the loglikelihood function

Parameters:

context (SamplingContext)

generate_utility(prefix, suffix)

Generate the utility function for one alternative

Parameters:

• prefix (str) – prefix to add to the attributes

• suffix (str) – suffix to add to the attributes

Return type:

Expression

get_cross_nested_logit()

Returns the expression for the log likelihood of the nested logit model

Return type:

Expression

get_logit()

Returns the expression for the log likelihood of the logit model

Return type:

Expression

get_nested_logit(nests)

Returns the expression for the log likelihood of the nested logit model

Parameters:

nests (NestsForNestedLogit) – A tuple containing as many items as nests. Each item is also a tuple containing two items:

Return type:

Expression

• an object of type biogeme.expressions.expr.Expression representing the nest parameter,

• a list containing the list of identifiers of the alternatives belonging to the nest.

Example:

nesta = MUA ,[1, 2, 3]
nestb = MUB ,[4, 5, 6]
nests = nesta, nestb