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Discover LudwigThe phrase "about three points" is correct and usable in written English.
It can be used when estimating or approximating a numerical value, often in contexts such as academic scoring, measurements, or statistics.
Example: "The test scores improved by about three points compared to last year."
Alternatives: "approximately three points" or "roughly three points".
Exact(36)
If Romney doesn't reclaim it from Obama, who defeated John McCain there in 2008 by about three points, it is virtually impossible for him to win.
In Ohio in 2000, for example, George W. Bush was projected to win by eight points in the polling average, but carried the state by about three points instead.
Nate Silver, the polling guru at the Web site FiveThirtyEight, said that Comey's letter produced a swing of about three points in the popular vote in the handful of states that won Trump the Presidency.
In other words, the totality of state polling — dozens and dozens of state polls, looked at in a careful way — is most consistent with a race in which Mr. Obama leads Mr. Romney by about three points nationally, according to this approach.
In the case of temperature structuring alone an increase of the methacolein and methacrylic acid yield of about three points has been verified experimentally.
Across all nine states, Rasmussen's polls favored Mitt Romney by about three points more than the overall average.
Similar(24)
(For wide receivers, the mean is about ten points lower).
Mr. Bush won Colorado by about eight points in 2000.
Polls currently show Clinton beating him by about five points.
Can't you infer from that poll that Mr. Obama is ahead by about two points nationally?
(John McCain, by comparison, faced a gap of about five points in 2008).
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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