Day 1, regional economic modeling...yum! (What happened on 28 September)
From 28 through 30 September 2005, Rose Baker and I attended Regional Forecasting and Policy Analysis Workshop at the offices of Regional Economic Models, Inc. (REMI) in Amherst, Massachusetts. We attended the Workshop so that we could learn more about the general REMI regional economic model and specific new products offered by REMI for transportation and fiscal policy analysis.
We arrived in Amherst at about 2:00 am. Short night. The Workshop started at 9:00 am with a brief welcoming address by Fred Treyz, the CEO of REMI. Fred provided some context by discussing the recent hurricane Katrina disaster to frame some of the policy issues involved in economic analysis.As Fred said, "Unexpected events are to be expected." Fred emphasized that economic models are abstractions--complex abstractions, at that--of an even more complex economy. Economic models allow analysts to apprehend complex systems in economies.
Participants in the Workshop came from a diverse group of organizations. For instance, organizations represented included Northern Kentucky University, Illinois Department of Commerce and Economic Opportunity, North Country Council, University of Massachusetts, Team Northeast Ohio, Berkshire Regional Planning Commission, MIT, Connecticut Department of Commerce and Economic Opportunity, University of Connecticut, and, of course, Penn State.
Jon Lee, a REMI analyst, demonstrated the REMI Policy Insight economic model using a two-region example. Jon displayed and discussed the basic REMI variable elements for historical (1990-2002) and forecast periods (2003-2050). Jon used the two-region model to show the detailed baseline structure and outputs of REMI models using tabular and graphical information. Then, he worked through a simple simulation scenario in which he added employment to the tune of 500 workers in professional and technical services in the two-region economic area. Economic and demographic changes between the baseline and the simulation scenarios indicate the impacts of the added employment in the professional and technical services sector. Jon also demonstrated a REMI DevSight, a product that uses regional baseline information to develop a profile of the region(s) under analysis.
Another REMI analyst, Billy Leung, described the REMI product called TranSight, which is used in special applications that forecast highway/airport/rail financing, construction, and use. Travel demand data is included in Transight. Transportation projects involve construction, operation, and finance costs.VMT (vehicle miles traveled), VHT (vehicle hours traveled), and trip counts from some out-of-REMI-model estimation procedures (e.g., Tranplan, TransCAD) are input to TranSight.
Jon Lee started the afternoon with a presentation on analysis of multiple transportation corridors using REMI TranSight The project was a 22-mile road improvement in the state of Washington. This was a complicated analysis because much of the fiscal data seems so "squishy." Lots of imputation of the input data; but, small effects on the economy. I wonder how sensitive the findings are to error of imputation of inputs.
Two REMI folks, Adam Cooper and Julie Gressley (a Pennsylvania native!!), presented information about the analytical structure of the REMI Insight model. The absolute basics to understand the REMI model. Equations. Flow diagrams. Yahoooo! Love it. REMI Insight is, for my money, the most comprehensive analytical model of modern regional economies.REMI policy impact methodology requires, first, the construction of a baseline forecast--that is, a "status quo" forecast. Next, variables in the REMO model are changed on the basis of changes anticipated. For instance, employment in mining might increase if a new mine is opened in a region. Then, a policy forecast is created that includes the policy changes. The difference between the policy forecast and the "status quo" baseline forecast is the impact of the policy on the economy. The REMI model has many policy variables that the analyst can modify to portray the economic content of a policy initiative.
Day one of three. Looking forward to the remaining two days.