# 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 ?
The workshops introduced teachers to the multifaceted variable approach, which involved teaching the three aspects of pronumeral (unknowns, generalised numbers and variables), making use of a wide variety of real-life contexts.
To enter the equation the student needs to understand how the equation is formed and what operations were performed on the pronumeral and in what order.
Although the use of pronumerals (letters) to represent variables is not explicitly introduced in the Australian Curriculum: Mathematics until Year 7 (ACARA, 2009), several upper primary students were keen to explore and experiment with them.
The third is a little closer to home: Chris Linsell, Michael Cavanagh and Salma Tahir in their paper Using meaningful contexts to promote understanding of pronumerals, outline the positive impact of using of meaningful contexts for teaching algebra with junior secondary students' in New Zealand and Australia.

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