Browsing by Author "Magruder, Jeremy"

Now showing 1 - 2 of 2
  • Thumbnail Image
    Item
    Open Access
    Attrition in the Khayelitsha panel study (2000-2004)
    (2005) Magruder, Jeremy; Nattrass, Nicoli
    Despite the fact that the original study had not been designed as a panel study (and despite the fact that no attempt to track the respondents had been made in the intervening four years), the response rate was (as we argue below) reasonably good.? This paper describes the two waves of this Khayelitsha panel study, and provides an analysis of attrition.? The first wave of the data (KMP 2000) is publicly available in the Data First Resource Centre of the CSSR.?
  • Thumbnail Image
    Item
    Open Access
    Exploring attrition bias: the case of the Khayelitsha panel study (2000-2004)
    (Wiley, 2006) Magruder, Jeremy; Nattrass, Nicoli
    Attrition bias is a problem for users of panel data. Researchers need to know what socio-economic factors are associated with attrition, and whether this is of relevance for the kind of analysis they want to conduct. This paper discusses attrition bias in the 2000/2004 Khayelitsha panel study. It shows that women, shack-dwellers and people living in smaller households are more likely to attrit, but that the impact of these variables on the probability of attrition is relatively small. The implications for labour-market analysis are then explored using Mincerian earnings functions and a probit regression on whether respondents are wage-employed or not. The coefficients generated using a restricted sample of non-attritors do not differ significantly from those generated by the entire sample. This suggests that attrition bias in this particular data set is not a problem for this kind of labour market analysis.