# Bayes theorem

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Related to Bayes theorem: conditional probability

## Bayes’ theorem

a theorem stating the probability of an event occurring if another event has occurred. Bayesian statistics is concerned with the revision of opinion in the light of new information, i.e. hypotheses are set up, tested, and revised in the light of the data collected. On each successive occasion there emerges a different probability of the hypothesis being correct – ‘prior opinions are changed by data, through the operation of Bayes’ theorem, to yield posterior opinions’ (Phillips, 1973).
Collins Dictionary of Sociology, 3rd ed. © HarperCollins Publishers 2000
References in periodicals archive ?
Joyce and many others think of Bayes Theorem as an obvious truth, and even a mathematical triviality.
In the proposed PSABC approach, the parameter LIMIT does not only play the role but also is taken use of to control when the Bayes theorem works for achieving fast convergence of the algorithm.
The book begins with a literature review of applications in engineering and an introduction to basic concepts of conditional probabilities and the Bayes Theorem. Subsequent chapters introduce Bayesian methods for updating the mathematical models of dynamical systems, and discuss the problem of model updating with eigenvalue-eigenvector measurements.
When additional information on overloaded existing structures is gathered, it might be applied to improve the primary their reliability indices using the Bayes theorem. According to Madsen (1987), the revised failure probability of particular members can be expressed as follows:
where [P.sub.old]([theta])--prior as in Bayes theorem and [P.sub.old]([x.sub.new] | [theta])--Bayesian likelihood.
Bayes theorem is simply a mathematical way of expressing this phenomenon.
Hubey gives an understandable explanation of the process from the mathematics of belief (on the basis of Cox-Jaynes axioms) to the mathematics of probability (Bayes theorem), of clustering, hypothesis testing and receiver operating characteristics, and errors in measurement and judgement.
The first theoretical instrument is the Bayes theorem and the second the notion of the common cause.
He does this by first specifying a normal likelihood function to express his opinion about the experts' knowledge and then using Bayes Theorem. Namely he specifies that the distribution
The closest any mathematical approach has come to translating p-values into belief probabilities is Bayes Theorem.  Bayes Theorem specifies the additional information needed to translate something like a p-value into the likelihood that a hypothesis is true given the evidence.

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