# coefficient

## Definitions

### Aviation

- noun a mathematical quantity placed before and multiplying another

### Economics

- A number or symbol multiplied by a variable.
- In a regression analysis, the estimated numerical association between one variable and another, usually taken to represent the sign and size of the causal effect of one on the other.

### Electronics

- A constant in an algebraic equation, as opposed to a variable. For instance, in the expression 3x, 3 is the coefficient, and x is the variable.
- A numerical measure that describes a
__physical__ or __chemical__ property, and that is a constant under specified conditions. For instance, a __coefficient of attenuation__ or of __thermal__ __expansion__.

### Health Economics

(written as *Coefficient*)

A value or algebraic expression that expresses the structure of an equation. For example, in the equation y = c + a x + b z, a is the coefficient of x and b is the coefficient of z. c is the constant term.

http://www.dictionarycentral.com/definition/coefficient.html