The phrase "unknown variation" is grammatically correct and can be used in written English.
It refers to a variant or alternative that is not known or identified. It can be used in various contexts, such as in a scientific research study or in discussing a problem with multiple possible solutions. Example: The experiment yielded unexpected results, suggesting the presence of an unknown variation in the genetic makeup of the subjects. In this sentence, "unknown variation" implies a variation in the genetic makeup of the subjects that is unidentified or not previously known.
Estimating and quantifying the largely unknown variation that makes up biodiversity is one and the same as quantifying corresponding option values of biodiversity.
In the hierarchical variation case, it has provided a prototype example of the quantification of unknown variation and option value at one nominated scale of biodiversity.
Any "calculus" of biodiversity providing quantitative estimates of this unknown variation automatically provides at the same time a measure of those values that link to the need to maintain variety — option values and intrinsic values.
The random placement of the sensor in the depth dimension simulates the unknown variation of depth amongst the sensors, and can be reasonably assumed to be a superset of the equi-depth and known-depth scenarios.
Simulation and experimental results both demonstrated that the influence of the permittivity and the mass of the solids can be decoupled under certain conditions, which provide a mechanism to correct the possible errors due to the unknown variation of the solids permittivity, or moisture.
According to this guideline a conservative range of $0 $20,000 to prevent one additional complication represents an acceptable cost effectiveness ratio, considering the (unknown) variation of complications and the consequences of a complication in terms of prolonged hospital stay, re-intervention and patient burden.
Robust design is a philosophy that aims to ensure that a structure will be tolerant to unknown variations and imperfections.
Due to the unpredictable and unknown variations of the power system normal operating points the model parameters are unknown and time-varying.
Nevertheless, the potential always exists for unknown variations in the character of sub-pixel topography (among other uncertainties such as albedo variations) to introduce errors.
Conventional breeding brings about a large number of new and unknown variations at molecular level, yet it hardly ever creates any novel risk or hazard.
Using this approach, robots can perform manipulation tasks more efficiently, robustly, and flexibly, and they can even successfully accomplish previously unknown variations of tasks.
