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Proxy (statistics)
 
 
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In statistics
Statistics

Statistics is a Mathematics pertaining to the collection, analysis, interpretation or explanation, and presentation of data. It also provides tools for prediction and forecasting based on data....
, a proxy variable is something that is probably not in itself of any great interest, but from which a variable
Variable

A variable is a symbol that stands for a value that may vary; the term usually occurs in opposition to constant, which is a symbol for a non-varying value, i.e....
 of interest can be obtained. In order for this to be the case, the proxy variable must have a close correlation
Correlation

In probability theory and statistics, correlation indicates the strength and direction of a linear relationship between two random variables....
, not necessarily linear or positive, with the inferred value.








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In statistics
Statistics

Statistics is a Mathematics pertaining to the collection, analysis, interpretation or explanation, and presentation of data. It also provides tools for prediction and forecasting based on data....
, a proxy variable is something that is probably not in itself of any great interest, but from which a variable
Variable

A variable is a symbol that stands for a value that may vary; the term usually occurs in opposition to constant, which is a symbol for a non-varying value, i.e....
 of interest can be obtained. In order for this to be the case, the proxy variable must have a close correlation
Correlation

In probability theory and statistics, correlation indicates the strength and direction of a linear relationship between two random variables....
, not necessarily linear or positive, with the inferred value.

Examples

Per-capita GDP is often used as a proxy for measures of standard of living
Standard of living

The standard of living refers to the quality and quantity of goods and services available to people, and the way these goods and services are distributed within a population....
 or quality of life
Quality of life

Quality of life is the degree of well-being felt by an individual or group of people.Quality of life cannot be measured directly, however the perception of QOL is made up of of two components: the physical and the psychological....
.

Likewise, country of origin or birthplace might be used as a proxy for race.

See also

  • Instrumental variable
    Instrumental variable

    In statistics, econometrics, epidemiology and related disciplines, the method of instrumental variables is used to estimate causal relationships when controlled experiments are not feasible....
  • Proxy (climate)
    Proxy (climate)

    In climate research, a Proxy variable is something that is probably not in itself of any great interest, but from which a variable of interest can be obtained....