Variable

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Related to Extraneous variable: Intervening variable, Moderator variable, research hypothesis, Research design

Variable

An element in a model. For example, in the model RS&P_t+1 = a + b Tbill _t + e_t, where RS&P_t+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.

Research and quality improvement: different processes, different evidence

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.

Who is smarter, CTE or other students? A five-year high-stakes test score comparison answers the question

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.

Cognitive processes in children's reading and attention: the role of working memory, divided attention, and response inhibition

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.

Checklist for speed improvement. (Powerline)

Forecasting in this environment is particularly problematic as there are numerous and hard to quantify extraneous variables.

C&W report: market showing signs of stabilizing

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.

The Great Gun Fight

In fact, a host of extraneous variables need to be considered in order to estimate carbon fluctuations on a global scale.

Green Trees for Greenhouse Gases: A Fair Trade-Off?

To test, one must rigidly control extraneous variables and compare a practice with other known strategies.

Managing Patient Information Longitudinally

Calibration pictures were taken in a controlled environment to minimize effects of extraneous variables.

Photoscanning sharpens research focus: new techniques can improve agricultural engineering studies

My policy is that gun tests are always done with factory ammo so there's no opportunity for extraneous variables to slip in.

Hallelujah -- A .45 Revelation

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.