ABSTRACT
As we saw in Chapter 1, survey populations are constantly changing over time, both in composition and in the characteristics of their members. Changes in composition occur when members enter the survey population through birth (or reaching adulthood), immigration, or through leaving an institution (for a non-institutional population) or leave through death, emigration, or through entering an institution. Changes in characteristics include, for example, a change from married to divorced, or from a monthly income of US$2,000 to one of US$2,500. As also discussed in Chapter 1, these population changes give rise to a range of objectives for the analysis of survey data across time. This chapter reviews survey designs that produce the data needed to satisfy these various objectives.
