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Discover LudwigThe phrase "are a valid" is correct and usable in written English
It can be used when affirming the legitimacy or acceptability of something, often in a formal or technical context. Example: "The results of the experiment are a valid representation of the hypothesis we tested."
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"I don't know any academics who think HSMRs are a valid form of rating hospitals.
"Clearly standardized tests are a valid way of providing part of the picture," Mr. Riccobono said.
But the young are a valid audience for more sophisticated storytelling.
He wants E.V.s to succeed, and believes that they are a valid alternative — just not for mainstream consumers.
The results also suggest that pilot-scale raking studies are a valid approach when investigating raking on the full-scale.
The results demonstrate that inversion/eversion ankle stiffness measures on this device are a valid, repeatable and consistent measure.
If the opinion polls are a valid indicator, the Panamanian electorate will reject President Perez Balladeres's re-election bid, despite his expensive public relations campaign.
And she would probably insist that both views are a valid reflection of women's attitudes about their bodies, as well as their love-hate relationship with fashion.
They are a valid, analog alternative to HDMI cables and will provide excellent high-definition video.
Two-day diet records are a valid means of measuring food and nutrient intakes [17].
In summary, we demonstrate that ROS generation and oxidative stress are a valid test paradigm to compare NP toxicity.
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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