likelihood ratio

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1 In statistics, the ratio of two likelihood functions at a given value, especially the ratio of a likelihood function to the maximum likelihood, or in Bayesian inference, the ratio between (a) the probability of an observation or datum conditional on a hypothesis and (b) the probability of the same observation or datum conditional on an alternative hypothesis: P(D | H1)/P(D | H2).

2 In signal detection theory, the ratio (at a particular cutoff or criterion level of sensory activation) given by the probability of a response being due to signal plus noise divided by the probability of its being due to noise alone. Symbol: β.

Subjects: Psychology.

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