The phrase "discern the effect" is correct and usable in written English.
You can use it when discussing the ability to perceive or understand the impact of something.
Example: "In order to improve our marketing strategy, we need to discern the effect of our recent campaign on customer engagement."
Alternatives: "identify the impact" or "recognize the influence."
The 2002 winner, "Topdog/Underdog," opened the same week it won the award, so it is difficult to discern the effect the prize had on sales.
It also means it is impossible to discern the effect of the tougher regime on the falling number of jobseeker's allowance (JSA) claimants.
To discern the effect of modern human activity on the loss of species requires determining how fast species disappeared in the absence of that activity.
About 40% of adult smokers say they took up the habit before the age of 16.But it might be hard to discern the effect of plain packaging, because smoking is already in such steep decline.
Equipped with a special digital "dark energy camera" built at the Fermi National Accelerator Laboratory in Illinois, the telescope will embark this year on a survey of some 300 million galaxies in an effort to discern the effect of dark energy on the evolution of the universe.
However, although infestations started from human-populated places, it was not easy to visually discern the effect of population density on the probability of infection by the SM.
Using RT therefore seems to be an effective and promising strategy to better discern the effects of the room acoustics and to enhance the acoustical design of rooms for speech.
At Harris Farms in California's Central Valley, it is not difficult to discern the effects of the state's continuing drought.
Compared to my own studies, experiments like those designed to discern the effects of age and alcohol on laughter were captivating (both concluded that the more you drink/age, the less you understand, but the more you laugh).
Another large camera, known as the Dark Energy Survey, will swing into action at a mountaintop observatory in Chile, looking to discern the effects of dark energy on the history and evolution of the universe.
Environmental electromagnetic effects were screened using a semianechoic chamber, which allowed us to discern the effects associated with geomagnetic storms.
