The phrase "a certain margin" is correct and usable in written English.
It can be used when referring to an unspecified or approximate amount or degree of something, often in contexts involving limits or allowances.
Example: "The project was completed within a certain margin of error, ensuring the results were reliable."
Alternatives: "a specific range" or "an approximate limit".
The results tend to represent the wider electorate voting at the caucus sites, within a certain margin of sampling error.
There should be a federal election law requiring an automatic hand recount if the presidential vote count is within a certain margin.
Similarly, no democratic system, with its vulnerability to human error and mischief, can be calibrated to function precisely within a certain margin of error.
Surgeons say some radiation and medical oncologists insist on a certain margin size before starting the rest of the patient's treatment.
You are then set a variety of tasks, ranging from beating your reserve team on the training ground to beating sides by a certain margin, before embarking on the full Champions League programme.
Having won the first leg 28-13, Bristol had a certain margin for error this time but the ghosts of their grim play-off final defeats to London Welsh and Worcester in the past two seasons remained stubborn companions.
A certain stability margin should be satisfied and the actuator activity should not be too high.
We further propose to provide a certain guard margin to this reactive mechanism before the quality target limit is exceeded.
Proper well planning requires that the pressure inside the wellbore should overbalance the formation pressure by a certain safety margin.
Comparison between the experimental data and ASME design fatigue curves indicated that the present steel possessed a certain safety margin in simulated BWR water.
For example, for QCIs = 1, 2, 3, 4, if the PDB of a given QCI equals 300 ms, then we set (TQ^{text {QCI}_{m}}) to a lower value (e.g., 250 ms), thereby providing a certain operation margin (50 ms) before the PDB is exceeded.
