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The phrase "a certain fraction of" is correct and usable in written English.
It can be used when referring to an unspecified portion or percentage of a whole in various contexts, such as mathematics, statistics, or general discussions.
Example: "A certain fraction of the population prefers to work remotely rather than in an office setting."
Alternatives: "a specific portion of" or "a particular percentage of".
Exact(60)
A certain fraction of this time is regarded as being extremely risky.
These standards require that a certain fraction of electricity generation come from renewable sources.
These LCF tests were terminated after a certain fraction of the nominal life.
We show that a certain fraction of low-quality science characterizes all the equilibria in the basic model.
In Massachusetts, taxpayers are exempt from the mandate-associated penalties if the lowest premiums available to them exceed a certain fraction of income".
At each iteration, one of the N points is randomly chosen, and the current point is moved a certain fraction of the distance towards the chosen point.
Only a certain fraction of these new mutations will become established in the population--that is only a certain fraction will reach fixation.
This demand has to be satisfied by the capacity of the local charging station and by a certain fraction of the capacity of other stations within range.
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".
More suggestions(17)
a certain proportion of
a certain slice of
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a certain split of
a certain subset of
a certain tranche of
a certain amount of
a certain component of
a certain segment of
a certain share of
a precise fraction of
a specified fraction of
a certain section of
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a reasonable fraction of
a specific fraction of
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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