It might seem that following people over time provides the best indication of how people change with age. Sample attrition can undermine that assumption. This study describes the impact of health, impairment, and depression on attrition in the National Survey of Families and Households. It...

Surveys often sample adults across a broad range of ages, measuring the same outcomes in several interviews spaced during a period of years and comparing the changes observed across segments of the adult life course. Put in sequence, those change vectors provide a composite image of the...