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The phrase "a categorical variable" is correct and usable in written English.
It is typically used in statistics and research to refer to a variable that can take on one of a limited, fixed number of possible values, representing different categories or groups.
Example: "In our study, we analyzed the impact of a categorical variable, such as gender, on the outcomes of the experiment."
Alternatives: "a nominal variable" or "a qualitative variable".
Exact(60)
SWB is treated as a categorical variable.
This was defined as a categorical variable.
Gender "Gender": is a categorical variable having two categories (male and female) Fig. 6.
9Family income is reported as a categorical variable and in nominal terms.
In our study, time was also used as a categorical variable.
Year was treated as a categorical variable because it did not have a linear trend.
Finally, previous calculus experience is a categorical variable with three levels.
Exposures were captured either as continuous or a categorical variable.
Each strain was treated as a categorical variable in the linear model analyses.
The MDA prophage disease association was modelled with clonal complex included as a categorical variable.
Socioeconomic status was modeled as a categorical variable based on the three grade of employment groups.
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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