random variable

American  

noun

Statistics.

1. a quantity that takes any of a set of values with specified probabilities.

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random variable British  

noun

1.  rv.  statistics a quantity that may take any of a range of values, either continuous or discrete, which cannot be predicted with certainty but only described probabilistically

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Etymology

Origin of random variable

First recorded in 1935–40

Example Sentences

See Examples For:

random variable

A variable, or random variable, usually notated by capital letters such as X and Y, is a characteristic or measurement that can be determined for each member of a population.

From Textbooks ● Nov. 29, 2017

The random variable X in this case includes only the number of trials that were failures and does not count the trial that was a success in finding a person who had the disease.

From Textbooks ● Nov. 29, 2017

Remember that the area under the pdf for all possible values of the random variable is one, certainty.

From Textbooks ● Nov. 29, 2017

The random variable for the exponential distribution is continuous and often measures a passage of time, although it can be used in other applications.

From Textbooks ● Nov. 29, 2017

The myriad factors affecting innovativeness make the historian’s task paradoxically easier, by converting societal variation in innovativeness into essentially a random variable.

From "Guns, Germs, and Steel: The Fates of Human Societies" by Jared M. Diamond