"Control variables" refers to the factors or conditions that are kept constant or consistent in a scientific experiment, so that their effects can be separated and analyzed independently from the variable being tested. Full definition
We also include as control variables two conventional indicators of teacher quality: experience and possession of a graduate degree. (educationnext.org)
Our study used control variables including the age of the home, square footage, replacement cost, and construction type, to gather comparable quotes across a number of home insurance companies. (valuepenguin.com)
Models with 5 - speed automatic transmission utilize an electronically controlled variable transfer clutch in conjunction with a planetary - type center differential. (samarins.com)