Figure 2. Map of the observed numbers of severe cardiac defects among reported live births in 1981 (upper left), an example comprised of a single tract and its six nearest neighbors (upper right), and three simulated data sets based on a tripling “cluster” of disease risk in the indicated cluster (bottom row). Choropleth maps of the statistical power of test of clustering for various values of Shading within each map is Figure 3. Tango’s8 τ. according to the quantiles of power values. Circles represent distance radii associated with neighborhood weights of 0.5 (inner circle) and 0.05 (outer circle).
Figure 2. Map of the observed numbers of severe cardiac defects among reported live births in 1981 (upper left), an example “cluster” comprised of a single tract and its six nearest neighbors (upper right), and three simulated data sets based on a tripling of disease risk in the indicated cluster (bottom row). Figure 3. Choropleth maps of the statistical power of Tango’s8 test of clustering for various values of τ. Shading within each map is according to the quantiles of power values. Circles represent distance radii associated with neighborhood weights of 0.5 (inner circle) and 0.05 (outer circle).
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