Some comments on methods investigating disease risk around a point source

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Abstract
This chapter discusses a fundamental problem when assessing risk around a point source: the difficulty of specifying in advance the size of the area for which the risk is to be assessed. It describes how in the Small Areas Health Statistics Unit at the London School of Hygiene and Tropical Medicine, point sources are being investigated by obtaining observed and expected numbers of cases for a range of circles centred on the point source. The circles are similarly divided into strata and the rates appropriate for each stratum are applied to find expected numbers. In this way, the areas under study are compared with socio-economically similar areas, as well as areas from the same region.

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