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The phrase "a certain fraction" is correct and usable in written English.
It can be used when referring to an unspecified portion or percentage of a whole, often in mathematical or statistical contexts.
Example: "In the study, a certain fraction of participants reported experiencing side effects from the medication."
Alternatives: "a specific portion" or "an unspecified percentage".
Exact(60)
A certain fraction of this time is regarded as being extremely risky.
When he talks of offenders, he says that only "a certain fraction have to be incarcerated, which we do with a heavy heart".
In Massachusetts, taxpayers are exempt from the mandate-associated penalties if the lowest premiums available to them exceed a certain fraction of income".
The Op-Ed essay further asserts that "we can harvest a certain fraction of a fish population that has been overfished".
Whenever you say you're a physicist, there's a certain fraction of people who immediately go, "Oh, I hated physics in high school".
"Now it turns out that a certain fraction of the healthy population has prosopagnosia".
Each user is provided a certain fraction of the resources available to the system.
This means an actor becomes active if a certain fraction of its neighbors are active.
These LCF tests were terminated after a certain fraction of the nominal life.
Given the same hand, the program will not always take the same action, but instead will bet a certain fraction of the time and fold a certain fraction of the time.
But there is also a certain fraction of agents dispersed through the population that is always committed to vaccination.
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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