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Line 36: :<math>RR = \frac{IE/(IE + IN)}{CE/(CE + CN)} = \frac{IE(CE + CN)}{CE(IE + IN)}.</math> The sampling distribution of the <math>\log(RR)</math>is ~~approximately~~closer to normal than the distribution of RR,<ref>{{cite web\|url=https://www.stata.com/support/faqs/stat/2deltameth.html\|title=Standard errors, confidence intervals, and significance tests\|work=StataCorp LLC}}</ref>~~{{Failed verification\|date=January 2019}}~~ with standard error :<math>SE(\log(RR)) = \sqrt{\frac{IN}{IE(IE + IN)} + \frac{CN}{CE(CE + CN)}}.</math>

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