The phrase "affect the fraction of" is correct and usable in written English.
It can be used when discussing how one variable influences or changes a portion or percentage of another variable.
Example: "The new policy is expected to affect the fraction of employees who choose to work remotely."
Alternatives: "influence the proportion of" or "impact the share of".
Both the IA temperature and duration strongly affect the fraction of retained austenite that have transformed during tensile deformation and the resultant tensile properties.
This implies that mitochondria in ethanol-grown cultures have a much larger surface area than those in glucose-grown cells...In [researchers'] study, the different mitochondrial number and morphology observed in ethanol-and glucose-grown cells did not significantly affect the fraction of the cellular volume occupied by the mitochondria (6-76-7%able 1)." See notes above & beneath table.
Second, the IV-estimated coefficients displayed in column (2) show that immigration does affect the fraction of time worked by the natives who remain in their jobs.
Lowered oxygen levels can affect the fraction of N2O produced in denitrification and nitrification in various ways [24], [25], [26], making the overall effect of temperature difficult to predict.
It would also affect the fraction of the populations below specified 25-OH-D levels.
Bypassing regions highly abundant in drug-metabolizing enzymes can affect the fraction of absorbed drug FG.
None of the treatments significantly affected the fraction of sarcoplasmic and myofibrillar proteins.
The Ru particle size also affects the fraction of active surface oxygen.
The team then asked respondents which factors affected the fraction of their portfolio in stocks or their decision to avoid the stock market altogether.
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.
The TCM content affects the fraction of hydrogen bonding in these terpolymers, small content of TCM does not sacrifice the fraction of hydrogen-bonded association in and does not cause Tg decrease.
