odds

the likelihood of a thing occurring rather than not occurring the ratio by which one better's wager is greater than that of another

"he offered odds of two to one"

For the alternative rock band, see Odds (band).In probability theory and statistics the odds in favor of an event or a proposition are the quantity ''p'' / (1 − ''p''), where ''p'' is the probability of the event or proposition. The logarithm of the odds is the logit of the probability.Odds have long been the standard way of representing probability used by bookmakers, though the method of presenting odds varies by location.Taking an event with a 1 in 5 probability of occurring (i.e. 0.2 or 20%), then the odds are 0.2/(1−0.2) = 0.2/0.8 = 0.25.If you Fixed-odds gamblingbet 1 at fair odds and the event occurred, you would receive back 4 plus your original 1 stake. This would be presented by a United KingdomBritish bookmaker as odds of 4 to 1 ''against'' (written as 4/1), by a continental European bookmaker as 5.0 to include the returned stake, and by an United StatesAmerican bookmaker as +400 representing the gain from a 100 stake.By contrast, for an event with a 4 in 5 probability of occurring (i.e. 0.8 or 80%), then the odds are 0.8/(1−0.8) = 4. If you bet 4 at fair odds and the event occurred, you would receive back 1 plus your original 4 stake. This would be presented by a British bookmaker as odds of 4 to 1 ''on'' (written as 1/4), by a continental bookmaker as 1.25 to include the returned stake, and by an American bookmaker as −400 representing the stake necessary to gain 100.The odds are a ratio of probabilities; an odds ratio is a ratio of odds, that is, a ratio of ratios of probabilities. Odds-ratios are often used in analysis of clinical trials.

See also -

Probability theory

Statistics

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