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Module 1: Bivariate data

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Dependent and independent variables

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XSIQ
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Core Mathematics - Dependent and independent variables

Dependent and independent variables

Blood pressure is to some extent dependent on age

If one variable influences the other, then the variable being influenced
is said to be the _dependent_ variable (y). The variable causing the
influence is said to be the _independent_ variable (x).

The dependent variable is the response variable and the independent
variable is the explanatory variable.

* in comparing a person's height and weight, _weight_ is the dependent
variable and _height_ is the independent variable as we attempt to explain
variations in weight as a response to changes in height

* to some extent, age influences blood pressure so _blood pressure_ is
the dependent variable and_ age_ is the independent variable

* attendence at the zoo may be influenced by temperature so _attendence
_is the dependent variable and_ temperature _is the independent variable

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