Sankhya: The Indian Journal of Statistics

1999, Volume 61, Series B, Pt. 1, pp. 58--70



WAYNE A. FULLER and F. JAY BREIDT Iowa State University, Ames

SUMMARY. In a longitudinal survey conducted for k periods some units may be observed for less than k of the periods. Examples include surveys designed with partially overlapping subsamples, a pure panel survey with nonresponse, and a panel survey supplemented with additional samples for some of the time periods. Estimators of the regression type are exhibited for such surveys. An application to special studies associated with the National Resources Inventory is discussed.

AMS (1991) subject classification. Primary 62D05, secondary 62D10.

Key words and phrases. Longitudinal surveys, environmental monitoring, multiple phase samples, design of surveys.

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