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1994 • 733 citations

RANDOMIZATION BY CLUSTER

1981 • 674 citations

The logic in ecological: I. The logic of analysis.

1994 • 438 citations

The ecological effects of individual exposures and nonlinear disease dynamics in populations.

1994 • 223 citations

The logic in ecological: II. The logic of design.

1994 • 195 citations

Sample size requirements for stratified cluster randomization designs

1992 • 99 citations