# 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 classic literature ?
When, on the one hand, we see domesticated animals and plants, though often weak and sickly, yet breeding quite freely under confinement; and when, on the other hand, we see individuals, though taken young from a state of nature, perfectly tamed, long-lived, and healthy (of which I could give numerous instances), yet having their reproductive system so seriously affected by unperceived causes as to fail in acting, we need not be surprised at this system, when it does act under confinement, acting not quite regularly, and producing offspring not perfectly like their parents or variable.
The proportional width of the gape of mouth, the proportional length of the eyelids, of the orifice of the nostrils, of the tongue (not always in strict correlation with the length of beak), the size of the crop and of the upper part of the oesophagus; the development and abortion of the oil-gland; the number of the primary wing and caudal feathers; the relative length of wing and tail to each other and to the body; the relative length of leg and of the feet; the number of scutellae on the toes, the development of skin between the toes, are all points of structure which are variable.
Sometimes she struggled with her tears, but when she was desired to plead, she collected her powers and spoke in an audible although variable voice.
Indeed, the mercury itself is not so variable as this class of passengers, whom you will see, when the ship is going nobly through the water, quite pale with admiration, swearing that the captain beats all captains ever known, and even hinting at subscriptions for a piece of plate; and who, next morning, when the breeze has lulled, and all the sails hang useless in the idle air, shake their despondent heads again, and say, with screwed-up lips, they hope that captain is a sailor - but they shrewdly doubt him.
For the day after Lucy's visit there had been a sudden change in the weather; the heat and drought had given way to cold variable winds, and heavy falls of rain at intervals; and she had been forbidden to risk the contemplated journey until the weather should become more settled.
This step-by-step plan contained clear instructions to test the effect of one or more variables (characteristics) on another variable.
We designed our study to focus on this specific measurement because of highly reliable results in the animal literature showing that certain phthalates reduce AGD (and AGI) in rodents and because, as continuous variables, AGD and AGI would not require a large sample size to demonstrate this relationship, if it existed.
Multi-variable means manipulating (in this case) three variables and controlling four variables within limits.
A listing of any cases having any missing data for the variables being analyzed could be generated.
Multiple regression analyses were used to test the hypothesis that hours in general education predict student outcomes, above and beyond the prediction provided by the other independent variables known to be related to academic outcomes.
The barriers and facilitators that exist and an individual's perception of these variables interact with self-efficacy, outcome expectations, and goal-setting behavior to shape the individual's career-related actions and performance.

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