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The phrase "a standard deviation" is correct and usable in written English.
It is typically used in statistical contexts to describe the amount of variation or dispersion in a set of values.
Example: "In this study, the average score was 75 with a standard deviation of 10, indicating that most scores fell between 65 and 85."
Alternatives: "one standard deviation" or "the standard deviation value".
Exact(60)
Environmental covariates were standardized with a mean of 0 and a standard deviation of 1.
When some students miss school, their schools' math scores on standardized tests fall by up to 5percentt of a standard deviation.
It was two-tenths of a standard deviation.
Their exposure to "concentrated disadvantage"—an index that factors in several measures of poverty fell by half a standard deviation.
And he found only between one-quarter and one-half of a standard deviation in male and female hearing thresholds.
That child on average scores a third of a standard deviation lower on tests — the difference between 500 and 463 on the SAT.
Per DW-nominate scores, which is based on roll call voting, even the more conservative Minority Whip John Cornyn is within a standard deviation of his party's center.
As a matter of convention, average IQ has been defined as 100, with the distribution calibrated – again, purely by convention – to a standard deviation of 15.
Most people guess I weigh about a hundred and thirty-five pounds, with a standard deviation of plus or minus fifteen pounds.
Another form of a standard deviation calculation.
A standard deviation of 49 μm was found.
More suggestions(20)
a consistent deviation
a standard diversion
a standard error
a norm deviation
a standard variance
a standard spread
a standardised deviation
a standard divergence
a standard variation
a standardized deviation
a standard trend
a standard waiver
a quality deviation
a standard differential
a standard woman
a standard prefix
a standard hotel
a standard X-ray
a unique deviation
a sharp deviation
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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