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The phrase "the reference category" is correct and usable in written English.
It can be used in a sentence when discussing statistical methods or data analysis, specifically when talking about a variable that serves as a comparison or baseline for other categories. Example: "In our study, we used age as the reference category for determining the effects of different medications on patients' cholesterol levels."
Exact(60)
Ref refers to the reference category.
Within the reference category, the Yahoo!
dEthnic minorities as the reference category.
bRural region as the reference category.
bRural areas as the reference category.
The reference category is: risk rationing.
eAge below 25 as the reference category.
gAgricultural job as the reference category.
hNo formal education as the reference category.
iHaving housing problems as the reference category.
bNonagricultural jobs as the reference category.
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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