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The phrase "a correlation was" is correct and usable in written English.
It can be used when discussing the existence or observation of a relationship between two or more variables in research or analysis.
Example: "In the study, a correlation was found between exercise frequency and overall health."
Alternatives: "a relationship was" or "an association was".
Exact(60)
But Harley Means, a geologist at the Florida Geological Survey (FGS), told New Scientist that a correlation was not unlikely.
Such a correlation was not found for the left HG or STG in either group (all r<0.34, P>0.2).
A correlation was observed between the refractive index shift and thrombin concentration.
A correlation was developed to take into account frost effects on the friction factor.
A correlation was found between membrane affinity and antiviral activity against HIV-1.
A correlation was proposed to estimate leg centre temperature from shoulder temperature.
A correlation was found between leaf chlorophyll content (single photon avalanche diode value) and nodule number.
A correlation was found between the surfactant PC half-life and the duration of ECMO.
In participants with schizophrenia a correlation was found between processing speed impairment and negative symptoms.
A correlation was observed between metal ion's ability to alter HSA conformation and protein unfolding.
A correlation was found between the relative abundance of each strain and its specific denitrification activity.
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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