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The phrase "a quarter of this sample" is correct and usable in written English.
You can use it when referring to one-fourth of a specific sample in contexts such as research, statistics, or analysis.
Example: "In our study, we found that a quarter of this sample exhibited the desired characteristics."
Alternatives: "one-fourth of this sample" or "25% of this sample".
Exact(1)
On the depressed mood subscale, 23.8% of the sample had the maximum score of 100, indicating that almost a quarter of this sample reported no problems with depression.
Similar(59)
More than a quarter of the sample (28.5 percent) underwent this test between 2004 and 2006, and more than half of those patients (55 percent) had a repeat echocardiogram within three years, most commonly within a year of the first.
In this study, a quarter of the sample met criteria for a moderate TBI, and another 20% met criteria for a severe TBI.
Approximately one quarter of the sample had improved household SES between birth and the age of 15, while over a quarter of the sample had experienced a drop in relative household SES over this time frame.
A quarter of the sample of more than 1,000 companies said they planned to hire foreign workers over the coming months.
Co-occurring substance use disorders were also common, with more than a quarter of the sample having two or more substance use disorders.
"Only about a quarter of the sample reported feeling any emotional change.
A quarter of the sample (26.0%) knew a PLWHA.
A quarter of the sample was aged 90 + years.
About a quarter of the sample (26%, n=785) were uncertain.
Furthermore, there was a limited number of males, approximately a quarter of the sample size.
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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