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Econometric flexibility in microsimulation: an age-centred regression approach

Author

Listed:
  • John Sabelhaus

    (Department of Economics, University of Maryland, College Park, Maryland, 20742, and Investment Company Institute, 1401 H Street, NW, Washington, DC, 20005;)

  • Lina Walker

    (Public Policy Institute, AARP, Washington, DC.)

Abstract

This paper describes a strategy for estimating predictive equations that has been shown to work well in microsimulation modelling. The technique, referred to here as ?age-centred regression,? is particularly useful when the available data set for estimating a model equation is limited and the marginal effect of one or more explanatory variables might be expected to vary systematically by age. The examples used here to describe how age-centring works are taken from the labour supply equations in the Congressional Budget Office Long-Term (CBOLT) dynamic microsimulation model. By switching from a traditional single-equation approach to age-centred regression, we show that marginal effects of independent variables can vary significantly across age groups. The comparison also reveals that improvements in mean predictions by age can be achieved with little if any loss in statistical precision of coefficient estimates.

Suggested Citation

  • John Sabelhaus & Lina Walker, 2009. "Econometric flexibility in microsimulation: an age-centred regression approach," International Journal of Microsimulation, International Microsimulation Association, vol. 2(2), pages 1-14.
    • Handle: RePEc:ijm:journl:v:2:y:2009:i:2:p:1-14
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    File URL: http://ima.natsem.canberra.edu.au/IJM/V2_2/IJM_2_2_1.pdf
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    References listed on IDEAS

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    3. John Sabelhaus & Julie Topoleski, 2007. "Uncertain policy for an uncertain world: The case of social security," Journal of Policy Analysis and Management, John Wiley & Sons, Ltd., vol. 26(3), pages 507-525.
    4. Amy Rehder Harris & John Sabelhaus, 2005. "How Does Differential Mortality Affect Social Security Finances and Progressivity? Working Paper 2005-05," Working Papers 16493, Congressional Budget Office.
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