The phrase "a more significant factor" is correct and usable in written English.
It can be used when comparing the importance of different elements or influences in a particular context.
Example: "In the study of climate change, carbon emissions are a more significant factor than other pollutants."
Alternatives: "a more important element" or "a greater contributing factor".
But a more significant factor seems to be that an increasing number of people are unable to make ends meet.
In comparison with octane sensitivity, RON was a more significant factor in improving engine thermal efficiency.
It strikes me that a rising pitch count is a more significant factor in batters' increasing effectiveness within a game than a learning curve.
But a more significant factor in Mr. Alexander's victory may have been the lackluster performance of the Democratic candidate, Bob Clement, a seven-term congressman.
Historians, though, say the death of the North Vietnamese leader Ho Chi Minh in 1969 was probably a more significant factor.
A more significant factor, according to hydrologist Paulo Carneiro of the Federal University of Rio de Janeiro, is the reliability of water supply.
But it is a fact that conservatives have lately made ideology a much more significant factor in federal judicial appointments.
In another study, "Ethnicity, Insurgency, and Civil War," Fearon and the political scientist David D. Laitin discovered that even though in nations with exceptional ethnic pluralism, like Syria and Iraq, lines of conflict may be defined by ethnic identity, pluralism itself is not a notable predictor of civil war; poverty is a much more significant factor.
Fueled largely by the ill-fated 2014 Scottish Independence Referendum, the left-wing SNP (a pro-Independence Party) looks likely to be a dramatically more significant factor in the 2015 elections than in past campaigns.
In line with the theory, researchers found that as an island became less isolated due to an increase in human-assisted colonization, its area became a far more significant factor in determining biodiversity.
Furthermore, an increase in the diffusion coefficient with Li concentration was also found to be a much more significant factor than the reduction in the mechanical moduli, causing a prelithiated silicon anode to experience lower stress levels than pristine silicon.
