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Fig. 2 | International Journal of Health Geographics

Fig. 2

From: sparrpowR: a flexible R package to estimate statistical power to identify spatial clustering of two groups and its application

Fig. 2

Results of 10,000 sparrpowR iterations simulating 8 cases and 428 controls assuming multivariate normal distributions with standard deviations of 0.83 and 1.67 km, respectively. The green-colored area is sufficiently powered to detect a spatial cluster of cases relative to controls. The blue-colored area is insufficiently powered to detect a spatial cluster of cases relative to controls. The identified concentrated animal feeding operation (CAFO) is signified by the black “X” and the base map is of Fort Dodge, Iowa. The blue lines represent regions with radii of 5 and 10 km from the identified CAFO

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International Journal of Health Geographics

ISSN: 1476-072X