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Marginal Effects and Significance Testing with Heckman’s Sample Selection Model: A Methodological Note

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  • Colin Vance

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Abstract

This paper illustrates two techniques for calculating the statistical significance of the marginal effects derived from Heckman’s sample selection model,an increasingly common econometric specification in political science. The discussion draws on an analysis by Sweeney (2003) of the incidence and intensity of interstate disputes. After replicating his results, the paper presents the delta method and the nonparametric bootstrap as alternative techniques for obtaining standard errors of the marginal effects, which themselves are calculated from a transformation of the model parameters.The analysis reveals two variables for which misleading inferences are drawn with respect to the precision of the estimated coefficients in the original study, suggesting that significance testing of the derived marginal effects is warranted.

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File URL: http://repec.rwi-essen.de/files/DP_06_039.pdf
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Bibliographic Info

Paper provided by Rheinisch-Westfälisches Institut für Wirtschaftsforschung in its series RWI Discussion Papers with number 0039.

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Length: 14 pages
Date of creation: Apr 2006
Date of revision:
Handle: RePEc:rwi:dpaper:0039

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Related research

Keywords: Heckman model; statistical significance; delta method; nonparametric bootstrap; dispute severity;

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References

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  1. Weihua Guan, 2003. "From the help desk: Bootstrapped standard errors," Stata Journal, StataCorp LP, vol. 3(1), pages 71-80, March.
  2. Heckman, James J, 1979. "Sample Selection Bias as a Specification Error," Econometrica, Econometric Society, vol. 47(1), pages 153-61, January.
  3. Atanu Saha & Oral Capps & Patrick Byrne, 1997. "Calculating marginal effects in models for zero expenditures in household budgets using a Heckman-type correction," Applied Economics, Taylor & Francis Journals, vol. 29(10), pages 1311-1316.
  4. Rodolfo Hoffmann & Ana Lucia Kassouf, 2005. "Deriving conditional and unconditional marginal effects in log earnings equations estimated by Heckman's procedure," Applied Economics, Taylor & Francis Journals, vol. 37(11), pages 1303-1311.
  5. Papke, Leslie E. & Wooldridge, Jeffrey M., 2005. "A computational trick for delta-method standard errors," Economics Letters, Elsevier, vol. 86(3), pages 413-417, March.
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Cited by:
  1. Rhodes, Charles, 2012. "An Empirical Analysis of Socio-Demographic Stratification in Sweetened Carbonated Soft-Drink Purchasing," 2012 Annual Meeting, August 12-14, 2012, Seattle, Washington 124678, Agricultural and Applied Economics Association.
  2. Juergen Jung & Jialu Liu, 2011. "Does Health Insurance Decrease Health Expenditure Risk in Developing Countries? The Case of China," Working Papers 2011-04, Towson University, Department of Economics, revised Apr 2014.
  3. Annika Meng, 2010. "Long-term Care Responsibility and its Opportunity Costs," Ruhr Economic Papers 0168, Rheinisch-Westfälisches Institut für Wirtschaftsforschung, Ruhr-Universität Bochum, Universität Dortmund, Universität Duisburg-Essen.
  4. Checherita-Westphal, Cristina & Rother, Philipp, 2010. "The impact of high and growing government debt on economic growth: an empirical investigation for the euro area," Working Paper Series 1237, European Central Bank.
  5. Colin Vance & Nolan Ritter, 2013. "Is Peace a Missing Value or a Zero?," Ruhr Economic Papers 0466, Rheinisch-Westfälisches Institut für Wirtschaftsforschung, Ruhr-Universität Bochum, Universität Dortmund, Universität Duisburg-Essen.
  6. Checherita-Westphal, Cristina & Rother, Philipp, 2012. "The impact of high government debt on economic growth and its channels: An empirical investigation for the euro area," European Economic Review, Elsevier, vol. 56(7), pages 1392-1405.
  7. Cristina Checherita-Westphal & Andrew Hughes Hallett & Philipp Rother, 2014. "Fiscal sustainability using growth-maximizing debt targets," Applied Economics, Taylor & Francis Journals, vol. 46(6), pages 638-647, February.
  8. Colin Vance & Ralf Hedel, 2006. "On the Link between Urban Form and Automobile Use - Evidence from German Survey Data," RWI Discussion Papers 0048, Rheinisch-Westfälisches Institut für Wirtschaftsforschung.
  9. Manuel Frondel & Colin Vance, 2013. "On Interaction Effects: The Case of Heckit and Two-Part Models," Journal of Economics and Statistics (Jahrbuecher fuer Nationaloekonomie und Statistik), Justus-Liebig University Giessen, Department of Statistics and Economics, vol. 233(1), pages 22-38, January.
  10. Goss, Allen & Roberts, Gordon S., 2011. "The impact of corporate social responsibility on the cost of bank loans," Journal of Banking & Finance, Elsevier, vol. 35(7), pages 1794-1810, July.

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