Posterior Probability

What is a Posterior Probability?

Posterior Probability refers to the probability derived by updating the prior probability in the presence of new evidence. It is based on the Bayes theorem.

What is Marginal Probability?

Marginal probability P(B) is used in Bayes’ theorem and can be calculated as the sum of the joint probabilities over all possible events:

P(B) = ΣP(B|A) × P(A)

Where the sum is taken over all possible events A.

What is Expected Posterior Probability?

Posterior probability represents the revised belief or confidence in a hypothesis or event after considering observed data.



Posterior Probability

Posterior probability is a key concept in Bayesian statistics that represents the updated probability of a hypothesis given new evidence. It combines prior beliefs with new data to provide a revised probability that incorporates the new information.

In this article, we have covered Posterior Probability definition, formula, example and others in detail.

Table of Content

  • What Is a Posterior Probability?
    • Bayes’ Theorem Formula
    • Posterior Probability Formula
  • Applications of Posterior Probability
  • Example on Posterior Probability
  • FAQs on Posterior Probability

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What Is a Posterior Probability?

In Bayesian statistics, posterior probability is the revised or updated probability of an event after taking into account new information. The posterior probability is calculated by updating the prior probability using the Bayes Theorem....

Applications of Posterior Probability

Posterior probability has wide applications and some areas where posterior probability is used are:...

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A posterior probability, in Bayesian data, is the revised or updated possibility of an event occurring after taking into account new records. The posterior probability is calculated by updating the prior possibility with the use of Bayes’ theorem....

Example on Posterior Probability

Example 1: Suppose a medical test for a rare disease has a false positive rate of 5% and a false negative rate of 2%. The prevalence of the disease in the general population is 0.1%. If a person tests positive for the disease, what is the probability that the person actually has the disease (posterior probability)?...

FAQs on Posterior Probability

What is a Posterior Probability?...