Distribute Unplaced Jobs Model (DUJM)

Objective

The Distribute Unplaced Jobs Model predicts the location choices of new or relocating jobs within sectors that are assigned to scalable sectors. These sectors, like Military employment, are ones that it is unreasonable to attempt to model their location behavior using market-based models. A more plausible approach is to use user-specified events to capture any announced changes in employment levels, and to scale the employment proportionally to the existing employment distributions when no such information is available. The objective is to match control totals for these sectors in placing the employment in locations.

Algorithm

Jobs to be located by this model are those that were added by the EmploymentTransitionModel in scalable sectors (defined within the adhoc sector groups table). The model selects all those jobs with no location in these scalable sectors, and proportionately assigns them to buildings with existing jobs in the sector. No capacity is accounted for in the model, since information on building capacity is generally not available for these kinds of facilities.

Configuration

The configuration of the ELCM in the zone model system is summarized in the following table:

Element	Setting
Agent	Job
Location Set	Buildings - which are located on zones, so this is really a zone + building type location choice
Dependent Variable	Location of each job: building_id (zone and building_type)
Model Type	Monte Carlo Sampling

Data

The following tables are used by the Employment Location Choice Model in the zone-based version of UrbanSim.

Table Name	Brief Description
jobs	Jobs table with an inventory of employment
employment_sectors	Employment sectors, defined using NAICS or SIC classifications of industry
employment_adhoc_sector_groups	Ad hoc sector groups
buildings	Buildings from which available non-residential sqft are evaluated for location

-- PaulWaddell - 09 Dec 2009