# Variable

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## Variable

An element in a model. For example, in the model RS&Pt+1 = a + b Tbill t + et, where RS&Pt+1 is the return on the S&P in month t+1 and Tbill is the Tbill return at month t, both RS&P and Tbill are "variables" because they change through time; i.e., they are not constant.

## Variable

Anything that does not have a set value. In basic algebra, a variable is often expressed as "x." Variables in economics and finance may be measures such as GDP, prices, or interest rates. Analysts use complicated equations to determine the value of some variables at the present time and even more complicated equations to predict their possible future values. See also: Regression.

## variable

Something, such as stock prices, earnings, dividend payments, interest rates, and gross domestic product, that has no fixed quantitative value. See also dependent variable, independent variable.
References in periodicals archive ?
After inviting Julius to tell his story about Dave, John digresses into a character analysis in which he describes Julius as a man with a "curiously undeveloped nature" who is subject to moods "which were almost childish in their variableness," who indeed presented "the curious psychology spectacle of a mind enslaved long after the shackles had been struck off from the limbs of its possessor.
The Biblical book of James tells how "every good gift and perfect gift" comes from "the father of light in whom is no variableness or shadow of turning".
There was always a degree of unity combined with a degree of variableness.

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