It is possible to have multiple independent variables or multiple dependent variables Observable variables to measure quality of life include wealth, employment, environment, physical and mental health, education, recreation and leisure time, and social belonging. For instance, in multivariable calculus, one often encounters functions of the form z = f(x,y), where z is a dependent variable and x and y are independent variables
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In some contexts, a variable can be discrete in some ranges of the number line and continuous in others
In statistics, continuous and discrete variables are distinct statistical data types which are described with different probability distributions.
Joint distributions for any set of independent random variables the probability density function of their joint distribution is the product of their individual density functions. Variable (mathematics) in mathematics, a variable (from latin variabilis 'changeable') is a symbol, typically a letter, that refers to an unspecified mathematical object [1][2][3] one says colloquially that the variable represents or denotes the object, and that any valid candidate for the object is the value of the variable. While an attribute is often intuitive, the variable is the operationalized way in which the attribute is represented for further data processing
In data processing data are often represented by a combination of items (objects organized in rows), and multiple variables (organized in columns). Quality of life is a latent variable which cannot be measured directly, so observable variables are used to infer quality of life
