The phrase "affecting the fraction of" is correct and usable in written English.
It can be used in contexts where you are discussing how something influences or changes a specific portion or percentage of a whole.
Example: "The new policy is affecting the fraction of employees who work remotely."
Alternatives: "influencing the proportion of" or "impacting the share of".
The roles of plastic strain, annealing temperature, and annealing time in affecting the fraction of special boundaries (Fsp), and twin densities of thermo-mechanically processed commercially pure nickel are examined.
Among the three factors tested, the operating pressure was highly influential in affecting the fraction of the cells disrupted.
As observed above, the two static strategies are not capable of significantly affecting the fraction of contained followers, with the exception of Strategy 1 for specific values of the parameters in the extremist society.
In addition, differences in host genotype might influence transit times or the amount of digestive enzymes secreted, thus affecting the fraction of RS that survives digestion.
First, disrupting KIF17 motor activity strongly reduced ciliary D1R enrichment without affecting the fraction of receptor-positive cilia.
Thus, eliminating biases affecting the fraction of sites within a genomic region inferred to be polymorphic was essential for our analysis.
Moreover, the tail ends of the BMIQ type2 distribution better matched those of the type1 distribution without affecting the fractions of unmethylated, hemimethylated and fully methylated probes, which are preserved by the BMIQ transformation.
The team then asked respondents which factors affected the fraction of their portfolio in stocks or their decision to avoid the stock market altogether.
Both the IA temperature and duration strongly affect the fraction of retained austenite that have transformed during tensile deformation and the resultant tensile properties.
