The phrase "a marginal effect of" is correct and usable in written English.
It is typically used in statistical or economic contexts to describe the small or incremental impact of one variable on another.
Example: "The study found a marginal effect of education on income levels, suggesting that each additional year of schooling contributes slightly to higher earnings."
Alternatives: "a slight impact of" or "a minimal effect of".
Push those summer-born back a year and their GCSE results will improve, which may have a marginal effect of pushing up overall pass rates.
There is a marginal effect of inclination angles of the system on the convection in the enclosure.
A marginal effect of partial reconfiguration overhead on performance is observed, for instance, only two video frames are dropped for HD1080p60 during the reconfiguration time.
On the other hand, alloy 2 which had 1.08 wt% Mn exhibited a marginal effect of mixed-mode loading on fracture toughness.
Consequently Bayesian update techniques usually show a marginal effect of the result of visual inspections on the reliability of structures with respect to fatigue failure.
The characterization results evidenced a good coverage of the polyoxometalate (POM) onto the surface of TiO2 along with a marginal effect of the presence of the POM on the specific surface area, morphology and cristallinity of the samples.
For lowering the thermostat when temperature in the office was too high there was an marginal effect of Time, F 1,78) = 2.85, p < .10, showing a tendency to quicker adjustment of thermostat setting after the intervention.
Alterations in the PI 4,5 P2 distribution, which resulted in dramatic effects on the localization of Dia, had only a marginal effect on the localization of Rho1.
Pore volume characterization shows that the nanostructure deposition has only a marginal effect on the porosity of the MFI.
Importantly, preexisting immunity to Mycobacterium bovis BCG had only a marginal effect on the immunogenicity of recombinant M. smegmatis.
Lateralised sensory input through antennal amputation has only a marginal effect on expression levels of NrxI and NLG2 5, but a more pronounced effect on expression levels of NLG1.
