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Figure 3 | International Journal of Health Geographics

Figure 3

From: A procedure to characterize geographic distributions of rare disorders in cohorts

Figure 3

Sensitivity and specificity for a simulated rectangular cluster using an elliptical scan. One hundred simulations of a rectangular cluster with aspect ratio varying from 2 to 10, relative risk = 2, background prevalence = 0.004 and nmax= 1,000. The higher aspect ratios create narrow elongated clusters that are harder to capture giving the tests lower sensitivity and having less effect on specificity.

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