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The incidence rate as a function of d, a, and t is equal to the ratio of two quantities. The numerator is the summation over i of w sub i times cap i sub i as a function of d, a, and t. The denominator is the summation over i of w sub i times e sub i as a function of d, a, and t.

Back to Appendix B, Twelfth Graphic Equation
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