The phrase "a matter of estimate" is correct and usable in written English.
It can be used when discussing something that requires an estimation or approximation rather than an exact measurement.
Example: "The project's budget is still a matter of estimate, as we are waiting for final quotes from the suppliers."
Alternatives: "a question of estimation" or "a case of approximation".
From there, it is a matter of estimating where everything goes by comparing the squares.
As a matter of fact, estimate (35) is in fact obtained as a corollary of the one in (105) via the standard Campanato's integral characterisation of Hölder continuous functions [10].
But for Mr Obama and his European allies, as well as for the new Israeli government of Binyamin Netanyahu, the real test will still be Iran's progress towards self-sufficiency in producing nuclear fuel, which could let it, perhaps in a matter of months (estimates vary), make a bomb.
As a matter of fact estimates (31) and (106) are equivalent by noticing that if v solves then so does v - k, whenever k is a real number.
Even the size of their brains is a matter of debate: estimates range from 100-500 million brain cells, depending on the species in question and who you ask.
In an extreme case, demand for goods on which tariffs are raised might be completely inelastic, so the rise may not matter (except as a matter of principle).An estimate of this sort does exist; World Bank economists have used existing estimates of the elasticity of demand to tease out the effect of everything countries did, tariff and anti-dumping-wise, last year.
He has raised $175,000 in a matter of weeks, and estimates $100,000 has been spent on lawyers so far.
Just how many soldiers have graduated from Mr. bin Laden's camps is a matter of conjecture, with estimates in the thousands.
But the stakes could be higher still.Though British reserves of shale gas are still largely a matter of guesswork, some estimates point to rather large stocks.
The size of the contribution made by international governance especially the EU's institutions to Brussels's economy is a matter of some controversy; estimates of the number of people employed in the international sector range from about 4 to 10 percent of the region's workforce.
