Odds is a see also of probability As nouns the difference between odds and probability is that odds is the ratio of the probabilities of an event happening to that of it not happening while probability is the state of being probable; The product of that division is called the odds ratio (OR) In our example, the odds of delivering a premature baby in smokers is 8 / 42, which comes out to 019 The odds of delivering a premature baby in nonsmokers is 13 / 87, which comes out to 015 The OR is 019 / 015, or about 127An odds ratio (OR) is a statistic that quantifies the strength of the association between two events, A and B The odds ratio is defined as the ratio of the odds of A in the presence of B and the odds of A in the absence of B, or equivalently (due to symmetry), the ratio of the odds of B in the presence of A and the odds of B in the absence of ATwo events are independent if and only if
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