The phrase "assignment to either" is correct and usable in written English.
It can be used when referring to the allocation of tasks or responsibilities to one of two options or parties.
Example: "The assignment to either team will depend on their availability and expertise."
Alternatives: "allocation to either" or "assignment to one of the two."
Design: A mixed design was employed with random assignment to either Groups A, B, or C (equal numbers of males and females per group).
Control is most readily accomplished through random assignment, which means that the procedures by which participants are assigned to a treatment and control condition ensure that each has equal probability of assignment to either group.
To prospectively compare pregnancy rates for couples undergoing IUI by a single healthcare provider with random assignment to either rigid (Tomcat; Kendall Sovereign, Mansfield, MA) or flexible (Soft Pass; Cook, Spencer, IN) catheters.
A random number generator determined the assignment to either LBSS or sutures at time of surgery.
Assignment to either Botox or placebo was blinded to participants, treating physicians (injectors) and investigators who assessed the patients in follow up visits.
The assignment to either provincial or connector hubs was based on the participation coefficient (pci) thresholds defined in the methods.
Among P. digitatum CAZymes, 49 have clear assignments to either glycoside hydrolases (GH), carbohydrate esterases (CE) or polysaccharide lyases (PL) involved in fungal cell wall degradation, a number close to the 52 found in P. chrysogenum.
As a large part of the All worms could not be reliably assigned to either Bright or Dim clusters (noted earlier), we assumed that the random assignment of unclear All specimens to either of these clusters was responsible for the low confidence estimates.
Those genes that have an assigned function have such an assignment due to either an experiment verifying that function or high sequence similarity to an experimentally-confirmed gene.
The lower recruitment appeared to be due to the requirement that participants agree to random assignment to training at either of two periods.
A public announcement noted only that an agreement had been negotiated "without admission," meaning that there was no assignment of wrongdoing to either party.
