biogeme_database_define_variable: Define a derived database variable using a complete Biogeme...

In rbiogeme: Interface to 'Biogeme'

Define a derived database variable using a complete Biogeme expression

Description

Define a derived database variable using a complete Biogeme expression

Usage

biogeme_database_define_variable(database, name, expression)

database_define_variable(database, name, expression)

define_variable(database, name, expression)

Arguments

database	A biogeme_database object.
name	Name of the derived column.
expression	Complete Biogeme expression.

Details

The expression is retained symbolically and is compiled by the Python bridge together with the model. It is not evaluated by an R callback during estimation or simulation.

Value

A new database specification.

Examples

database <- biogeme_database(
  "demo",
  data.frame(time = c(10, 12), cost = c(5, 6))
)
database <- biogeme_database_define_variable(
  database, "time_cost", variable("time") / variable("cost")
)
biogeme_database_columns(database)

rbiogeme documentation built on Sept. 29, 2026, 5:09 p.m.