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The Knox Method and Other Tests for Space-Time Interaction
Article first published online: 26 MAY 2004
Volume 55, Issue 2, pages 544–552, June 1999
How to Cite
Kulldorff, M. and Hjalmars, U. (1999), The Knox Method and Other Tests for Space-Time Interaction. Biometrics, 55: 544–552. doi: 10.1111/j.0006-341X.1999.00544.x
- Issue published online: 26 MAY 2004
- Article first published online: 26 MAY 2004
- Received September 1997. Revised July 1998. Accepted August 1998.
- Jacquez's test;
- Knox test;
- Mantel's test;
- Population shifts;
- Space-time clustering;
- Spatial statistics
Summary. The Knox method, as well as other tests for space-time interaction, are biased when there are geographical population shifts, i.e., when there are different percent population growths in different regions. In this paper, the size of the population shift bias is investigated for the Knox test, and it is shown that it can be a considerable problem. A Monte Carlo method for constructing unbiased space-time interaction tests is then presented and illustrated on the Knox test as well as for a combined Knox test. Practical implications are discussed in terms of the interpretation of past results and the design of future studies.