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Discover LudwigThe phrase "a decrease in proficiency" is correct and usable in written English.
It can be used when discussing a decline in skill or ability in a particular area or task.
Example: "The recent changes in the curriculum have led to a noticeable decrease in proficiency among students in mathematics."
Alternatives: "a decline in skill" or "a drop in competence."
Exact(2)
It's been suggested that the benefits of caffeine, in terms of heightened focus, might be offset by a decrease in proficiency at more imaginative tasks.
The analyses represent an attempt to examine two (possibly overlapping) potential explanations for the changes in achievement observed in Ireland: (i) the decline in PISA scores is due to a decrease in engagement (ii) the decline in PISA scores is due to a decrease in proficiency.
Similar(58)
For some applications, this restriction might be too strict, for example, the decrease in proficiency could be stronger for a switching point in earlier item positions and could diminish when PD affects only the very last items.
Thus, the average proficiency was lower in the decline classes and the decrease in proficiency when PD onset occurred earlier in the test was steeper in the academic group.
"Ivan took a decrease in compensation last year.
A decrease in height.
This served to ascertain that possible differences in face recognition between controls and CPs can not be explained by a general decrease in visual proficiency among the CP participants.
Would you board a plane whose pilot had been approved to fly with a decreased proficiency?
But decreases were measured too, including a 19percentt decrease in reports of criminal mischief and an 11percentt decrease in menacing.
"It brings an overall decrease in violence".
Legibility shows a similar decline with decreasing proficiency in all cases, indicating that calculated proficiencies correlate reasonably well with actual function.
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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