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state variable
(systems theory) A variable that describes the state of a dynamical system.
flow variable
(economics, accounting) A variable whose value depends on a period of time rather than an instant, example being the gross domestic product.
register variable
(programming) A variable whose value is stored directly in a register for faster access.
propositional variable
(logic) A variable that can either be true or false.
extraneous variable
(statistics) A random variable that is not an independent variable and may bear any effect on the behaviour of the subject being studied.
confounding variable
(statistics) An extraneous variable in a statistical model that correlates (positively or negatively) with both the dependent variable and the independent variable.
cardinal variable
A variable whose values are ordered, that can be multiplied by a scalar, and for which the magnitude of differences in values is meaningful.
standardized variable
(mathematics, statistics) The value of a variable minus its mean, divided by its standard deviation.