The phrase "an uncontrollable factor" is correct and usable in written English.
You can use it when referring to an element or variable that cannot be managed or influenced in a given situation.
Example: "The project's success was hindered by an uncontrollable factor, such as the sudden change in market conditions."
Alternatives: "an unpredictable element" or "a variable beyond control".
In view of typically unknown combination function among input variables, we use a Taguchi design to improve the practicality of our study results by letting it as an uncontrollable factor.
This number varied because it was determined by an uncontrollable factor, the number of children actually playing at each playground on a given sampling day.
As the various confounding factors (such as demographic, exposure or biologic) have been controlled for (Martin et al., 1998; Baeten et al., 2007b) this suggests the existence of still an uncontrollable factor, explaining the increased risk of HIV-infection among these high-risk women.
The staffing and activity levels of a hospital at the time of a major incident may be a vital (but uncontrollable) factor in the response [ 18].
While the designers of such repositories say they are confident that the waste will be safely incarcerated, the most uncontrollable factor is future archaeologists or others with a penchant for digging.
The level 2 represents the main factors which include human resource, product, process, control, and uncontrollable factor.
Accordingly, and especially for real-world situations, attention must be paid simultaneously to more than one controllable or uncontrollable factor.
One possible reason is that DHI effects may involve variables that are sensitive to unknown, uncontrolled, or uncontrollable factors.
Rural households must deal with high-income fluctuations as exposed to a variety of uncontrollable factors such as climate conditions, economic fluctuations, policy uncertainty, and individual-specific shock4 (Bardhan and Udry 1999; Dercon 2002).
It is well known that uncontrollable factors in an abstract including quality of randomization, surgical procedure, measurement of final results would cause great bias to the meta-analysis.
Even the most careful economic analysis is likely to conclude that uncontrollable factors play a major role.
