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Effect of spatial resolution on cluster detection: a simulation study
Al Ozonoff1, Caroline Jeffery, Justin Manjourides
1Department of Biostatistics, Harvard School of Public Health, 655 Huntington Avenue, Boston, MA 02115, USA. aozonoff@bu.edu
Background:
Aggregation of spatial data is intended to protect privacy, but some effects of aggregation on spatial methods have not yet been quantified.
Methods:
We generated 3,000 spatial data sets and evaluated power of detection at 12 different levels of aggregation using the spatial scan statistic implemented in SaTScan v6.0.
Results:
Power to detect clusters decreased from nearly 100% when using exact locations to roughly 40% at the coarsest level of spatial resolution.
Conclusion:
Aggregation has the potential for obfuscation.
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