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The phrase "a factor of two or three" is correct and usable in written English.
It can be used when discussing multiplicative relationships or comparisons, often in mathematical or scientific contexts.
Example: "The results of the experiment showed an increase in efficiency by a factor of two or three, depending on the conditions."
Alternatives: "twice or thrice" or "twofold or threefold".
Exact(22)
Three, the officials estimates on the number of AIDS cases are seriously exaggerated, perhaps by a factor of two or three, she says.
"I think the current fastest time is about six months, so we're trying to beat that by a factor of two or three," said team member Adler Smith '17, a mechanical engineering major.
There's a reactor being finished in Finland where the cost overruns you'd be better than I, but they are a factor of two or three over the initial multi-billion dollar price.
But once manufacturers start processing it, our testing has found that we're not looking at a factor of two or three anymore, we're looking at a factor of 10 or 20.
This drug, still by far the most popular in Britain, has been losing users steadily since the mid 2000s, even while the product strengthened – by a factor of two or three, according to DrugScope.
Generally, if a formation is invaded by saline filtrate for a week, the deep laterolog reading will be less by a factor of two or three than true formation resistivity.
Similar(37)
Trucks can up transport costs by a factor of five, and rail by a factor of three or four.
scores by a factor of two.
But we didn't come within a factor of two.
A factor of two?
Maybe a factor of five".
More suggestions(17)
a combination of two or three
a matter of two or three
a minimum of two or three
a staff of two or three
a configuration of two or three
a mixture of two or three
a game of two or three
a maximum of two or three
a pace of two or three
a family of two or three
a crew of two or three
a panel of two or three
a habit of two or three
a group of two or three
a team of two or three
a list of two or three
a case of two or three
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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