underlyingvariable
nounUK /ˌʌndəˈlaɪɪŋ ˈveəriəbl/
US /ˌʌndərˈlaɪɪŋ ˈveriəbl/
A hidden thing that can change and makes other things happen.
The scientist found an underlying variable that explained why the plants grew at different speeds.
OTHER MEANINGS
2. In statistics, a factor that is not directly measured but is assumed to affect the results.
The researchers controlled for an underlying variable that could skew the survey data.
3. In math, a quantity that is not stated openly but affects an equation or model.
The equation had an underlying variable that changed the outcome of the graph.
4. A basic reason or condition that is not obvious but explains a situation.
Poverty is often an underlying variable behind poor health in the community.