# 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 the groups ran participants they are required to submit a brief experimental report containing a methods section, a results section (presenting descriptive data) and a discussion section (discussing extraneous variables).
Extraneous variables are acknowledged but no attempt is made to control them (Newhouse et al., 2006).
The differences in scores between the groups can be attributed to the effects of the extraneous variables and not because of curriculum choice.
As before, CA and IQ were entered as extraneous variables at Steps 1 and 2 of regression analyses.
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.
A few limitations include extraneous variables, technology, and communication.
Research has confirmed the common belief that instructional outcomes are influenced by "extraneous variables." It is important to separate the contributions of the teacher from the contributions of extraneous factors to student learning, and that is the purpose of the IDEA system's adjusted ratings.
At the immediate post-test, extraneous variables that may have affected participants' responses to the messages in addition to threat and efficacy perceptions were measured to control for their influences.
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. It appears that the worst is over in technology dependent markets.
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.

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