biogeme.expressions.normalcdf module¶

Arithmetic expressions accepted by Biogeme: normal cdf

author:: Michel Bierlaire
date:: Sat Sep 9 15:51:53 2023

class biogeme.expressions.normalcdf.NormalCdf(child)[source]¶

Bases: UnaryOperator

Cumulative Distribution Function of a normal random variable

Parameters:: child (ExpressionOrNumeric)

deep_flat_copy()[source]¶

Provides a copy of the expression. It is deep in the sense that it generates copies of the children. It is flat in the sense that any MultipleExpression is transformed into the currently selected expression. The flat part is irrelevant for this expression.

Return type:: NormalCdf

get_value()[source]¶

Evaluates the value of the expression

Returns:: value of the expression
Return type:: float

recursive_construct_jax_function(numerically_safe)[source]¶

Generates a function to be used by biogeme_jax. Must be overloaded: by each expression

Return type:: JaxFunctionType
Returns:: the function takes two parameters: the parameters, and one row of the database.
Parameters:: numerically_safe (book)

recursive_construct_pymc_model_builder()[source]¶

PyMC builder for NormalCdf: - evaluate the child expression - apply Φ(x) = 0.5 * (1 + erf(x / √2)) elementwise

Return type:: PymcModelBuilderType