Xvariable

Xvariable is a term used in mathematics, statistics, and computer science to denote a variable that typically represents an input or independent quantity. In many contexts, the symbol x is used as the primary independent variable. In algebra, x is the unknown in equations such as x^2 + 3x - 4 = 0. In the study of functions, a dependent outcome y is expressed as a function of x, written y = f(x); here, x serves as the input argument.

In statistics and data analysis, the x-variable is the predictor or explanatory variable, while the y-variable is the response. In regression and related models, the goal is to describe or predict y from x. When multiple inputs are involved, analysts refer to several x-variables, commonly denoted x1, x2, ..., xn, with the input vector x = (x1, x2, ..., xn). In machine learning, the set of features forms the input vector x used to predict a target y.

Notation and terminology: the compound form 'xvariable' is informal and nonstandard. More precise terms include independent variable, input feature, predictor variable, or feature vector. In programming, a variable may be named x or xVariable according to language guidelines.

See also: independent variable; dependent variable; predictor variable; feature; regression; input.