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Attrition in the Kwazulu Natal income dynamics study, 1993-1998

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  • Maluccio, John A.

Abstract

This paper examines attrition in the KwaZulu-Natal Income Dynamics Study (1993–1998) and assesses the extent of attrition bias for a specific empirical example. The analysis shows that 1993 first round nonresponse is largely unrelated to observable characteristics of the communities other than indicators of migration activity. Multivariate regressions are then used to describe the characteristics of the households attriting in 1998, revealing the importance of distinguishing between two types of attriting households, those that moved and those that apparently moved but left no trace. For example, increased household size reduced the probability of either type of attrition, whereas measures of higher quality of fieldwork in the 1993 survey only reduced the probability that a household left no trace. While observable differences between attritors and non-attritors indicate attrition is nonrandom, it does not necessarily follow that estimated relationships based on the non-attriting sample suffer from attrition bias. To more directly explore attrition bias, which is by its nature model specific, this analysis estimates household-level expenditure functions correcting for attrition bias using standard Heckman selection procedures and a quality of 1993 interview variablesas identifying instruments. There is positive selection, and although many of the other parameter estimates are quite similar, a Hausman test rejects the equality of coefficients between the corrected and uncorrected models. Therefore, this study concludes, at least for this simple case, that attrition does appear to bias the “behavioral” coefficients.

Suggested Citation

  • Maluccio, John A., 2000. "Attrition in the Kwazulu Natal income dynamics study, 1993-1998," FCND briefs 95, International Food Policy Research Institute (IFPRI).
  • Handle: RePEc:fpr:fcndbr:95
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    1. Jeffrey E. Zabel, 1998. "An Analysis of Attrition in the Panel Study of Income Dynamics and the Survey of Income and Program Participation with an Application to a Model of Labor Market Behavior," Journal of Human Resources, University of Wisconsin Press, vol. 33(2), pages 479-506.
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    10. John A. Maluccio, 2004. "Using Quality of Interview Information to Assess Nonrandom Attrition Bias in Developing-Country Panel Data," Review of Development Economics, Wiley Blackwell, vol. 8(1), pages 91-109, February.
    11. Smith, J-P & Thomas, D, 1997. "Migration in Retrospect : Remembrances of Things Past," Papers 97-06, RAND - Labor and Population Program.
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    13. Datt, Gaurav & Jolliffe, Dean & Sharma, Manohar, 1998. "A profile of poverty in Egypt: 1997," FCND discussion papers 49, International Food Policy Research Institute (IFPRI).
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    Cited by:

    1. M. Angeles Balsells & Crescencia Pastor & Pere Amorós & Ainoa Mateos & Carmen Ponce & Alicia Navajas, 2014. "Child Welfare and Successful Reunification through the Socio-Educative Process: Training Needs among Biological Families in Spain," Social Sciences, MDPI, Open Access Journal, vol. 3(4), pages 1-18, October.
    2. repec:dau:papers:123456789/5443 is not listed on IDEAS

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