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. 2013 Mar;19(3):493–496. doi: 10.3201/eid1903.121453

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Formula used to calculate geospatial statistic (a modified log-likelihood ratio [LLR]) on the basis of geographic distribution of Mycobacterium tuberculosis genotype clusters, Washington, USA. Variables are classified as follows: a = number of tuberculosis (TB) cases with the genotype of interest in the selected county; b = number of cases with the genotype of interest in the United States; c = number of cases without the genotype of interest in the selected county; d = number of cases without the genotype of interest in the United States; N = total number of TB cases.