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Defining and Using Residential Submarkets in Planning Work

Defining and Using Residential Submarkets in Planning Work. Clifford A. Lipscomb, Ph.D. Director of Economic Research Greenfield Advisors, LLC Seattle, WA and Atlanta, GA United States of America. Greenfield Advisors. 37-year-old firm headquartered in Seattle, WA, USA

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Defining and Using Residential Submarkets in Planning Work

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  1. Defining and Using Residential Submarkets in Planning Work Clifford A. Lipscomb, Ph.D. Director of Economic Research Greenfield Advisors, LLC Seattle, WA and Atlanta, GA United States of America

  2. Greenfield Advisors • 37-year-old firm headquartered in Seattle, WA, USA • Real estate valuation, economic research, survey design and administration, specialty in complex valuation issues (i.e. we don’t do appraisals for banks/lenders) • Most of our work is litigation support • Current cool project: patent infringement

  3. The Big Picture • People and households are heterogeneous (different) • How different are they? • Socioeconomic • Racial • Demographic • Others • How can we measure the differences? Are they “systematic”?

  4. Why is This Important? • Price prediction (submarkets improve model accuracy) • Formulation of market strategy • Understanding housing market structure • Improving lenders’ and investors’ ability to price risk associated with homeownership • Public policy implications • Policy tailored to one “type” may not be best • Policy inertia (is a mid-course correction possible after a policy is implemented?)

  5. Terminology • What is a market? • What is a submarket? • How can we define submarkets? • Housing stock (similar packages of housing services) • Geography (traditional neighborhoods) • Household characteristics (data intensive) • Surveys that ask about who are your “peers” – good for comparative studies • Hybrid methods

  6. Rest of the Presentation • Focus on an Atlanta neighborhood • Talk about external and internal factors affecting the neighborhood • Discuss how a change in land use can affect the neighborhood

  7. Home Park

  8. North Home Park South Home Park Home Park green space Sales Price Distribution

  9. Determining Submarkets • Motivation – assumptions in the literature • Publically available data was limited (Census tract block group was smallest unit available) • Houses are the unit of analysis, so need that level of detail in demographics • Differences between renters and owners • Door-to-door survey effort • 51% response rate

  10. Empirical Model • Round 1: Cluster analysis establishes groups • Round 2: Refines groups into “types” based on a variation of linear regression model (SUR) • Houses are sorted into types based on the appraised value that minimizes error • Determines the number of types without researcher pre-determination! Because what if the researcher draws an arbitrary boundary…

  11. Original Household Types

  12. Submarkets • A: Undergraduate student renters • B: Other student renters, young professionals, and young married couples • C: Owners and graduate students • Note: Recent research has tightened the distinctions between submarkets using different econometric estimators (Belasco, Farmer, and Lipscomb 2012)

  13. Dynamic Issues • What happens to neighborhood if you put in a pocket park? • Simulation results • Simulation 1: if preference for park access stays same • Simulation 2: if preference for park is ½ of current estimate

  14. Location of New Pocket Park

  15. What Happens After Re-sorting? • Models predict that mix of residents will change by 30% as a result of pocket park • Student renters are “forced out” as new owner-occupiers enter the neighborhood • Change in amenity mix = change in occupant • Did pocket park simply accelerate resident mix that was going to happen anyway?

  16. Types After Pocket Park

  17. Implications • Policymakers and planners need to plan with preference heterogeneity in mind • A more granular level of data needed to complete comprehensive plans • E.g. new MARTA rail stop will be used by what “type” of households? • E.g. what “types” are attracted to TODs?

  18. Implications (2) • Balancing housing affordability with housing construction (micro-apartments targeting urban professionals living alone) • Planners can influence the “types” of residents attracted to a neighborhood – influence can be latent or manifest • Planners plan for change and can influence that change

  19. Summary • Economists and planners often use data at one geographic scale when analyzing phenomena at a different scale • Make sure statistical methods are an empirical translation of your theory • Beware of post hoc ergo propter hoc fallacy (“after this, therefore because of this”) • All methods have limitations; so seek to mitigate them and show relevance relative to other methods

  20. Contact Information:Clifford A. Lipscomb, Ph.D.Director of Economic ResearchGreenfield Advisors, LLC1870 The Exchange SE, Suite 100Atlanta, GA 30339USAE-mail: cliff@greenfieldadvisors.comWeb: www.greenfieldadvisors.com Thank you

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