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The observed relative risk of a cohort study is found to be 0.7. In reality, the true risk ratio is 1.3. In what direction is

The observed relative risk of a cohort study is found to be 0.7. In reality, the true risk ratio is 1.3. In what direction is the observed risk ratio biased? What should we consider when the true ratio and the observed ratiohave a null value between them?

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