# Unit measure

**Unit measure** is an axiom of probability theory [1] that states that the probability of the entire sample space is equal to one (unity); that is, *P*(*S*)=1 where *S* is the sample space. Loosely speaking, it means that *S* must be chosen so that when the experiment is performed, *something* happens. The term *measure* here refers to the measure-theoretic approach to probability.

Violations of unit measure have been reported in arguments about the outcomes of events [2][3] under which events acquire "probabilities" that are not the probabilities of probability theory. In situations such as these the term "probability" serves as a false premise to the associated argument.

## References

- A. Kolmogorov, "Foundations of the theory of probability" 1933. English translation by Nathan Morrison 1956 copyright Chelsea Publishing Company.
- R. Christensen and T. Reichert: "Unit measure violations in pattern recognition: ambiguity and irrelevancy" Pattern Recognition, 8, No. 4 1976.
- T. Oldberg and R. Christensen "Erratic measure" NDE for the Energy Industry 1995, American Society of Mechanical Engineers, New York, NY.

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