Household Allocation Module of Oregon2 Model
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The Oregon2 model is a set of seven integrated modules that together simulate the land use-transport system in the state of Oregon. One of these modules, called the household allocation module, updates the economic and demographic attributes of each person and household in a synthetic population, including age, sex, occupation, work and student status, job holdings, household membership, primary- and secondary-home size and location, income, and car ownership. It uses an agent-based microsimulation with Monte Carlo selection to identify choice outcomes and state transitions for each person or household concerning each economic or demographic attribute considered, with selection probabilities determined by using logit models and sampling distributions that are functions of relevant alternative attributes and household or person characteristics. Initial parameter values were estimated with data from Oregon household travel surveys, the University of Michigan Panel Survey of Income Dynamics, U.S. census data, and other published statistics. Spatial locations are represented in a system of roughly 3,000 geographic zones covering the study area. Six housing types, eight occupation categories, and continuous quantities for housing size and income are also represented. Housing markets are represented by using a disequilibrium structure, in which prices in each zone are updated in response to the vacancy rate relative to a reference rate, moving toward but not necessarily reaching a market-clearing solution.