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A new proposal to adjust Moran's I for population density

✍ Scribed by Renato M. Assunção; Edna A. Reis

Publisher
John Wiley and Sons
Year
1999
Tongue
English
Weight
205 KB
Volume
18
Category
Article
ISSN
0277-6715

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✦ Synopsis

We analyse the e ect of using prevalence rates based on populations with di erent sizes in the power of spatial independence tests. We compare the well known spatial correlation Moran's index to three indexes obtained after adjusting for population density, one proposed by Oden, another proposed by Waldh or, and a third proposed by us in this paper. We ÿnd an e ect of spatially correlated populations in the type I error probability on the test based on Moran's and Waldh or's indexes. We conclude also that the test proposed by Oden is powerful to test risk heterogeneity, but it has disadvantages when the interest is solely on the spatial correlation of morbidity risks. In this latter case, we recommend using our proposed test which is more powerful than the usual Moran's index applied directly to the rates.

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