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The phrase "a direct causal link" is correct and usable in written English.
It can be used when discussing a clear and straightforward relationship between two events or phenomena, indicating that one directly causes the other.
Example: "The study found a direct causal link between air pollution and respiratory diseases."
Alternatives: "a clear cause-and-effect relationship" or "a straightforward causal connection".
Exact(60)
Manson doesn't recall quite such a direct causal link.
There was, he said, a direct "causal link" between the movie and the murders.
According to the authors, the experiment suggests "a direct causal link between food advertising and greater snack consumption".
Of course, it is not possible to construct a direct causal link between any single weather event and climate change.
Inferring a direct causal link between climate change and any specific flood or hurricane is unscientific.
The violence graduation hypothesis assumes a direct causal link between animal cruelty and interpersonal aggression.
The report appeared to be the first to draw a direct causal link between public corruption and armed conflict in South Sudan, the world's youngest country.
At the moment the risk of a direct causal link between eating salmon and cancer or other health problems is perceived to be small.
The CSJ assumes a direct causal link between single mothers and numerous undesirable social effects, and its proposed fix is that people should marry before they have children.
The prosecution argued there was a direct causal link between Wallace's act in throwing acid at Mark van Dongen and his decision to end his life by euthanasia.
"I have not yet seen or heard a direct causal link between the Frankfurt Book Fair and anything that has happened back in China," she says.
More suggestions(17)
a direct causal relationships
a direct causal dependence
a mechanical causal link
a possible causal link
a direct causal process
a direct causal interpretation
a direct causal working
a direct causal role
a direct causal result
a direct causal association
a direct causal effect
a direct causal influence
a direct causal chain
a precise causal link
a direct mechanistic link
a direct functional link
a direct cause effect link
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com