A hybrid sampling design that reuses clusters but not individuals across time can substantially lower the variance of difference-in-differences estimators relative to repeated cross-sectional sampling.
Optimal survey design for community intervention evaluations: cohort or cross-sectional? Journal of clinical epidemiology, 48 0 (12): 0 1461--1472, 1995
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Repeated sampling of different individuals within the same clusters to improve precision of longitudinal estimators: the DISC design
A hybrid sampling design that reuses clusters but not individuals across time can substantially lower the variance of difference-in-differences estimators relative to repeated cross-sectional sampling.