The problem of respondent attrition: survey methodology is key

The central problem of longitudinal surveys is attrition. The National Longitudinal Survey of Youth in 1979 (NLSY79), which this issue of the Monthly Labor Review features, is the gold standard for sample retention against which longitudinal surveys are usually measured. However, we cannot understand how the NLSY79 has done so well without considering what was done differently in the other cohorts of the NLS and what we have learned by formal evaluations of attrition aversion measures that evolved over a quarter century of field work. The lessons here are hard-won and, to some, unconventional.