# Difference between revisions of "Bayesian probability"

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==Blog posts== | ==Blog posts== | ||

− | *[http://lesswrong.com/lw/s6/probability_is_subjectively_objective/ Probability is Subjectively Objective | + | *[http://lesswrong.com/lw/s6/probability_is_subjectively_objective/ Probability is Subjectively Objective] |

− | *[http://lesswrong.com/lw/oj/probability_is_in_the_mind/ Probability is in the Mind | + | *[http://lesswrong.com/lw/oj/probability_is_in_the_mind/ Probability is in the Mind] |

− | *[http://lesswrong.com/lw/sg/when_not_to_use_probabilities/ When (Not) To Use Probabilities | + | *[http://lesswrong.com/lw/sg/when_not_to_use_probabilities/ When (Not) To Use Probabilities] |

*{{lesswrongtag|Probability}} | *{{lesswrongtag|Probability}} | ||

## Revision as of 06:03, 17 November 2009

**Bayesian probability** represents a level of certainty relating to a potential outcome or idea. This is in contrast to a frequentist probability that represents the frequency with which a particular outcome will occur over any number of trials.

An event with Bayesian probability of .6 (or 60%) should be interpreted as stating "With confidence 60%, this event contains the true outcome", whereas a frequentist interpretation would view it as stating "Over 100 trials, we should observe event X approximately 60 times."

The difference is more apparent when discussing ideas. A frequentist will not assign probability to an idea, either it is true or false and it cannot be true 6 times out of 10.

## Blog posts

- Probability is Subjectively Objective
- Probability is in the Mind
- When (Not) To Use Probabilities
- All Less Wrong posts tagged "Probability"