- ProbabilityAndStatistics
- StatisticalRegularity -- ProbabilityAxioms -- PersonalProbability -- EclecticProbability

*Statistical Regularity* has motivated the development of the **relative frequency** concept of probability. Most of the procedures commonly used to make statistical estimates or tests were developed by statisticians who used this concept exclusively. They are usually called *frequentists*. This school is often associated with the names of [Jerzy Neyman] and [Egon Pearson] who described the logic of statistical hypothesis testing.

Prior to and during the 1950's and 1960's, there was a debate among statisticians which featured the *frequentists* versus the *Bayesians*. The former insisted that statistical procedures only made sense when one uses the relative frequency concept. The Bayesians supported the use of *degrees of belief* as a basis for a new form of statistical practice.