A spatial scan statistic for ordinal data
- 23 June 2006
- journal article
- research article
- Published by Wiley in Statistics in Medicine
- Vol. 26 (7), 1594-1607
- https://doi.org/10.1002/sim.2607
Abstract
Spatial scan statistics are widely used for count data to detect geographical disease clusters of high or low incidence, mortality or prevalence and to evaluate their statistical significance. Some data are ordinal or continuous in nature, however, so that it is necessary to dichotomize the data to use a traditional scan statistic for count data. There is then a loss of information and the choice of cut‐off point is often arbitrary. In this paper, we propose a spatial scan statistic for ordinal data, which allows us to analyse such data incorporating the ordinal structure without making any further assumptions. The test statistic is based on a likelihood ratio test and evaluated using Monte Carlo hypothesis testing. The proposed method is illustrated using prostate cancer grade and stage data from the Maryland Cancer Registry. The statistical power, sensitivity and positive predicted value of the test are examined through a simulation study. Copyright © 2006 John Wiley & Sons, Ltd.Keywords
Funding Information
- Centers for Disease Control and Prevention (CDC) and the Association of American Medical Colleges (MM-0870)
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