Module 4 Panel Data Jonathan Haughton June 2017 Measuring poverty

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Presentation transcript:

Module 4 Panel Data Jonathan Haughton June 2017 Measuring poverty Multidimensional poverty Poverty Dynamics Panel Data Inference with Panel Data International Poverty Comparisons Vulnerability Tackling Poverty Module 4 Panel Data Jonathan Haughton jhaughton@Suffolk.edu June 2017

JH: Course on Poverty Measurement Objectives Examine the advantages of panel surveys Explain how panel data can measure changes in poverty more precisely Summarize the drawbacks of panel surveys, including attrition bias, decreased representativeness, and high managerial demands June 2017 JH: Course on Poverty Measurement

JH: Course on Poverty Measurement Types of panel data Households e.g. 1993 and 1998 Vietnam Living Standards Surveys Dwellings e.g. Peru Living Standards Survey: in 1990 returned to 1,280 dwellings in Lima area Individuals e.g. U.S. Panel Survey on Income Dynamics (PSID), individuals surveyed regularly since 1968 June 2017 JH: Course on Poverty Measurement

JH: Course on Poverty Measurement Hybrids Constructed from repeated cross-sections e.g. Khandker et al. on districts in Thailand Rotating panels e.g. Cote d’Ivoire. 1985: 1600 hh. 1986: 800 of these + 800 others. June 2017 JH: Course on Poverty Measurement

Advantages of Panel Surveys Only way to measure transitions over time Less need for retrospective reporting Greater precision (see next slide) So smaller sample OK Can control for unobserved characteristics (see Module 5) Useful in impact evaluation June 2017 JH: Course on Poverty Measurement

JH / Panel Data / NISR, Kigali Precision If independent samples: t-statistic = 0.181, not significant t = 1.348 if n=500 If paired t-statistic = 5.393, change statistically v. significant Implication: Smaller samples OK May 26, 2017 JH / Panel Data / NISR, Kigali

Types of poverty (Rwanda example) Chronically poor need support Transiently non-chronically poor need insurance May 26, 2017 JH / Panel Data / NISR, Kigali

JH: Course on Poverty Measurement June 2017 JH: Course on Poverty Measurement

JH: Course on Poverty Measurement Targeting is hard June 2017 JH: Course on Poverty Measurement

Drawbacks of Panel Data Attrition bias e.g. Michigan PSID: 12-15% dropped out after 1st round, and 2.4% p.a. dropped out after that. Loss of representativeness e.g. Over time, panel would age, leaving out newly-formed couples Defining the household: which to follow? e.g. year 0: husband + wife1 + child1 year 2: husband + wife2 + child2 // wife1 + child1 Cost Track households, needs good management June 2017 JH: Course on Poverty Measurement

JH: Course on Poverty Measurement Reading Haughton & Khandker, chapter 11 Jalan and Ravallion (1998) on targeting Jalan, Jyotsna, and Martin Ravallion. 1998. “Transient Poverty in Postreform Rural China.” Journal of Comparative Economics 26: 338–357. Khandker, Koolwal, Haughton & Jitsuchon (2012) on constructing a hybrid panel Khandker, Shahidur, Gayatri Koolwal, Jonathan Haughton, and Somchai Jitsuchon. 2012. Household Coping and Response to Government Stimulus in an Economic Crisis. Policy Research Working Paper, World Bank, Washington DC. June 2017 JH: Course on Poverty Measurement