odds ratio

Suppose the probability of an event A is not 1. The odds of the event A is the ratio


For example, if the odds of landing a head in a coin flip is 2, then the probability of landing a head is twice as likely as that of landing a tail.

In a 2×2 contingency tableMathworldPlanetmath, with a dichotomous explanatory variable X having levels 1 and 2, and a binary response variable Y with success and failure as two possible levels of outcomes:

Title odds ratio
Canonical name OddsRatio
Date of creation 2013-03-22 14:41:07
Last modified on 2013-03-22 14:41:07
Owner CWoo (3771)
Last modified by CWoo (3771)
Numerical id 10
Author CWoo (3771)
Entry type Definition
Classification msc 62H20
Classification msc 62H17
Defines odds
Defines log-odds ratio