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The phrase "an observational study" is correct and usable in written English.
You can use it when referring to a type of research method that involves observing subjects in their natural environment without manipulation.
Example: "The researchers conducted an observational study to gather data on the behavior of the participants in their daily lives."
Alternatives: "a non-experimental study" or "a descriptive study".
Exact(58)
This Lancet study was an observational study: they grouped participants by salt intake and then observed how they did.
"This is an observational study only.
This is a bold claim for an observational study.
It is an observational study, not a randomized trial, so cause and effect cannot be definitively established.
This is an observational study.
Study Design: This was an observational study.
[27] performed an observational study with 24 participants in total.
However, this was an observational study reflecting routine practice.
This is an observational study from a single center.
This is an observational study without any specific intervention.
"Obviously, this is what we call an observational study," he says.
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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