Unwin, Antony. 'Geary's contiguity ratio'. - Economic & Social Review, Vol. 27, No. 2, January, 1996, pp. 145-159, Dublin: Economic & Social Research Institute
Forty years ago Geary published a paper oil spatial statistics introducing the contiguity
ratio, c, to measure spatial pattern. He discussed c not only as a direct measure but as a regression diagnostic for assessing spatial association amongst regression residuals, c has continued to be used and this paper describes its properties, its current status and how work in this area has developed, emphasising particularly the complementary new approaches offered by interactive graphics tools.
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