The phrase "a certain variation of" is correct and usable in written English.
It can be used when referring to a specific type or form of something that is not precisely defined or is somewhat ambiguous.
Example: "In the study, we examined a certain variation of the traditional recipe that included unique spices."
Alternatives: "a specific type of" or "a particular form of".
There remains a certain variation of the p-values - a direct comparison is not meaningful.
The growth is consistent over a certain variation of CH4 flow rate and growth time.
Variation of the conditions is accompanied by a certain variation of the properties, but the principal component is β-MnO2.
As we can see from these equations, both the Okapi BM25 and Ltu scores are only a certain variation of the conventional tf-idf weighting.
In this paper, a simplified but reasonably accurate approach for quantifying discontinuity effects is developed for general shells of revolution of a certain variation of thickness along the shell meridian, and applied to the present problem of the 3-region egg-shaped digestor shell, to yield explicit closed-form results for discontinuity, and hence net, stresses throughout the digestor.
People in the study who had a certain variation of a gene called TAS2R48 were more likely to eat too much sodium than those who did not have this variant, according to the study, presented today (Nov. 13) at the American Heart Association's Scientific Sessions meeting in New Orleans.
In light of the burgeoning volume and certain variation of in-hospital outcomes of cardiac operations in China, a large patient-level registry was needed.
Last year, researchers led by reproductive endocrinologist Carolyn Coulam of the Rinehart Center for Reproductive Medicine in Evanston, Illinois, found an association between women carrying certain variations of p53 and problems conceiving, but the mechanism was unclear.
It was always the same landscape except occasionally (in certain variations of the dream), there would be people on the riverbank and, sometimes across the river, there would be people and houses on the other side.
What's more, healthy people with certain variations of two genes that regulate the neurotransmitter serotonin have more active amygdalas.
