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The phrase "a previous study was" is correct and usable in written English.
It can be used when referring to findings or conclusions from a study that was conducted before the current discussion or analysis.
Example: "A previous study was conducted to examine the effects of sleep on cognitive performance, revealing significant results."
Alternatives: "an earlier study was" or "a prior study was".
Exact(36)
The worn geometry is well predicted although the wear rate, estimated from experiments presented in a previous study, was overestimated.
The distributions of these quantified properties across the media thickness were characterized and their relationship with the mechanical properties from a previous study was determined.
The improved milk fat content and yield observed in a previous study was due to increased nutrient intake rather than altering the F C ratio.
A three-dimensional, transient VRFB model developed in a previous study was employed to simulate VRFBs under two degrees of electrode compression (10% vs. 20%).
A three-dimensional, non-isothermal VRFB model developed in a previous study was applied to a range of single cell structures equipped with CP-based electrodes and flow channels in the current collectors.
This work was motivated by the desire to improve the long-term durability of E-glass/Hysol 9394 epoxy/Al-6XN stainless steel joints whose fracture energy in a previous study was shown to fall from ∼950 J/m2 (ambient) to a mere ∼88 J/m2 after only two days of exposure to a 90%RH, 50 °C environment.
Similar(24)
A blast data base developed in a previous study is used in the current study.
Post-fire mechanical properties obtained from a previous study were used in this study.
Porous carbon xerogels synthesized in a previous study were investigated as catalysts supports.
The experimental data reported in a previous study were used to build the neural network.
An ignition delay time correlation for methyl acetate (MA) from a previous study is also employed in the comparison.
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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