attrition rates, especially in developing countries where rural–urban migration is prevalent. In this paper, we discuss the … rate of 78.8 percent, more than halving attrition compared to a standard dwelling-based follow-up rule. The tracking … and follow-up of individuals, without which attrition is likely to remain a source of bias even after a tracking procedure …

on a representative sample of 2000 households. Using event history data and very detailed information on social networks …