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The incidence rate, cap ir, a function of d, a, and t is the ratio of two quantities. The numerator is the weighted sum, denoted by w sub i, across i individuals of the outcome of cap i sub i of d, a, and t. The denominator is the weighted sum across i individuals of w sub i, of the outcome of e sub i of d, a, and t.

Return to Appendix B, Tenth Equation