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The phrase "a control variable" is correct and usable in written English.
It is typically used in research and scientific contexts to refer to a variable that is kept constant to test the relationship between other variables.
Example: "In this experiment, we will use temperature as a control variable to ensure that it does not affect the outcome of our results."
Alternatives: "a constant variable" or "a regulated variable".
Exact(60)
For the MVA, we included real GDP per capita in 2016 as a control variable (data obtained from Eurostat).
We also included parasite stress as a control variable because it has been shown to correlate with mean personality traits23,32.
Immunity is gained through vaccination with the vaccine distribution considered a control variable.
The system degradation was modeled using melt flow index (MFI) as a control variable.
Inflation is also used as a control variable.
Thus, we included "education" as a control variable.
We also include firm experience as a control variable.
These data were utilized as a control variable.
This paper also chooses industry as a control variable.
The assets variable was used as both an independent and a control variable.
We address this issue by first introducing the variable MR Page as a control variable.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com