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Encyclopedia > Dependent variable

In experimental design, a dependent variable (also known as response variable, responding variable or regressand) is a factor whose values in different treatment conditions are compared. That is, the experimenter is interested in determining if the value of the dependent variable varies when the values of another variable – the independent variable – are varied, and by how much. In simple terms, the independent variable is said to cause an apparent change in, or simply affect, the dependent variable. In analysis, researchers usually want to explain why the dependent variable has a certain value. In research, the values of a dependent variable in different settings are usually compared. The first statistician to consider a methodology for the design of experiments was Sir Ronald A. Fisher. ... In an experimental design, the independent variable (also known as predictor or regressor or manipulated variable) is the variable which is manipulated or selected by the experimenter to determine its relationship to an observed phenomenon (the dependent variable). ...


Other terms for the dependent variable are y-variable, outcome variable and response variable.


Scientific usage

When observing a physical process, the dependent variable is measured by the scientist in order to determine the effect of the independent variable. Often the dependent variable is a physical quality measured on a system that changes over time, possibly as a result of adjusting another physical parameter (the independent variable). To visualize the effect of the independent variable on the dependent variable, a line chart is commonly used. This effect is also called the “response” or the “relation”. The dependent variable is the response to the independent variable. In an experimental design, the independent variable (also known as predictor or regressor or manipulated variable) is the variable which is manipulated or selected by the experimenter to determine its relationship to an observed phenomenon (the dependent variable). ... A pocket watch, a device used to keep time There are two distinct views on the meaning of time. ... In an experimental design, the independent variable (also known as predictor or regressor or manipulated variable) is the variable which is manipulated or selected by the experimenter to determine its relationship to an observed phenomenon (the dependent variable). ... In an experimental design, the independent variable (also known as predictor or regressor or manipulated variable) is the variable which is manipulated or selected by the experimenter to determine its relationship to an observed phenomenon (the dependent variable). ... In the physical sciences, tables of data collected from experiments on physical processes are often visualised through the use of a particular graph, sometimes called a line chart. ...


Mathematics usage

In the graphing of data, the dependent variable is graphed on the y-axis (see Cartesian coordinates). In the physical sciences, tables of data collected from experiments on physical processes are often visualised through the use of a particular graph, sometimes called a line chart. ... Cartesian means relating to the French mathematician and philosopher Descartes, who, among other things, worked to merge algebra and Euclidean geometry. ...


In mathematics, the dependent variable is usually represented as a function of the independent variables. For example, in the explicit equation y = 4x2 + x, the dependent variable y can be written as a function of the independent variable x, as y(x). When represented this way, it is more common to refer to the dependent variable as a function, and the independent variable as just a variable. Euclid, Greek mathematician, 3rd century BC, as imagined by by Raphael in this detail from The School of Athens. ... In an experimental design, the independent variable (also known as predictor or regressor or manipulated variable) is the variable which is manipulated or selected by the experimenter to determine its relationship to an observed phenomenon (the dependent variable). ... In an experimental design, the independent variable (also known as predictor or regressor or manipulated variable) is the variable which is manipulated or selected by the experimenter to determine its relationship to an observed phenomenon (the dependent variable). ...


Examples

In a study of how different dosages of a drug are related to the severity of symptoms of a disease, a measure of the severity of the symptoms of the disease is a dependent variable and the administration of the drug in specified doses is the independent variable. A researcher will compare the different values of the dependent variable (severity of the symptoms) and attempt to draw a conclusion. Dosage is Collective Souls fourth studio album, released on February 9, 1999. ... Oral medication A medication is a licenced drug taken to cure or reduce symptoms of an illness or medical condition. ... The term symptom (from the Greek syn = con/plus and pipto = fall, together meaning co-exist) has two similar meanings in the context of physical and mental health: Strictly, a symptom is a sensation or change in health function experienced by a patient. ... It has been suggested that Refractory disease be merged into this article or section. ...


In measuring the amount of colour removed from beetroot samples at different temperatures, the dependent variable would be the amount of pigment removed, because it is depending on the temperature (which is the independent variable).


  Results from FactBites:
 
Searching for Structure (statistics) (1384 words)
Explained variation is measured by the difference between the variation in the parent group and the sum of variation in the two children groups.
This is the slope of the dependent variable y on the covariate z in group g.
As predicted value for variable j, a case is assigned the proportion of cases having value 1 for this variable in the group to which the case belongs, i.e.
Variables (612 words)
In general the independent variable is manipulated by the experimenter and its effects on the dependent variable are measured.
In contrast, the dependent variable "memory test" is a quantitative variable since memory performance was measured on a quantitative scale (number correct).
Variables such as number of children in a household are called "discrete variables" since the possible scores are discrete points on the scale.
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