# 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 ?
Extraneous variables are acknowledged but no attempt is made to control them (Newhouse et al.
When the appropriate extraneous variables are built into the equation and controlled, there usually is no difference between CTE and other students on standardized test scores.
The aim of these analyses was to explore whether there was a unique association between cognitive measures and behavioural categorization of attention even after controls for possible extraneous variables, including literacy.
Finally, rehabilitation professionals, in developing rehabilitation plans, should realize the potential of extraneous variables to affect feelings of control and develop employment goals in settings which minimize the importance of these variables.
All of this points to genetic predisposition, rather than the myriad extraneous variables, as being the polestar ingredient in speed improvement.
Forecasting in this environment is particularly problematic as there are numerous and hard to quantify extraneous variables.
Presumably, according to Lott, the way to test this theory would be to do a linear regression involving as many extraneous variables as we can think of that might affect the Nasdaq--and not to worry too much that we may not have gotten them all.
In fact, a host of extraneous variables need to be considered in order to estimate carbon fluctuations on a global scale.
To test, one must rigidly control extraneous variables and compare a practice with other known strategies.
Calibration pictures were taken in a controlled environment to minimize effects of extraneous variables.
My policy is that gun tests are always done with factory ammo so there's no opportunity for extraneous variables to slip in.
Because such databases usually include studies designed by many different investigators who generally do not seek to address in a controlled fashion the relationship of interest to the meta-analyst, such comparability on extraneous variables is not to be expected.

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