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The phrase "a dummy variable for" is correct and usable in written English.
It is a technical term used in mathematics, statistics, and computer programming. For example, "We used a dummy variable for gender to control for potential bias in the study."
Exact(60)
A dummy variable for unemployment was also used.
The regression equation includes a dummy variable for each country, minus one reference country.
A dummy variable for CD or UC was used, except for the regression on surveillance colonoscopy.
It designates a dummy variable for a specific year and one per year.
A dummy variable for whether or not the household owns land and/or a house is also constructed.
Again, we include a dummy variable for New-to-market innovations against a baseline of new-to-firm innovations.
From the tenure variable, we constructed a dummy variable for homeownership with the reference category non-homeownership.
Conc k is a dummy variable for having an initially high industry concentration ratio, as explained below.
The outcome variable we construct is a dummy variable for whether a patient died, eloped, left against medical advice or left without seeing a doctor.
In addition, we included a dummy variable for being the oldest sibling, as birth order has a known effect on health [34].
The free lunch variable is simply a dummy variable for receipt of free or reduced-price lunch during the current school year.
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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