The phrase "a master variable" is correct and usable in written English.
It can be used in contexts related to research, statistics, or data analysis where a variable is considered to have significant influence over other variables.
Example: "In our study, we identified a master variable that significantly impacted the outcomes of our experiments."
Alternatives: "primary variable" or "key variable".
While flow has frequently been considered as a master variable that controls aquatic biodiversity and species behavior in river floodplains, little is known about thermal heterogeneity and its effect on aquatic biota in complex landscapes.
Dissolved organic matter, a complex mix of compounds that leeches into waterways and gives rivers and streams their color, is a "master variable" in water systems; In addition to introducing both nutrients and pollutants, DOM influences the escape of carbon dioxide from the water and can impact the amount of light that penetrates the water.
In this context, absolute water content is shown to be a universal master variable by means of which differences between individual environments can be normalised.
Solution pH is considered to be a master descriptive variable for characterization of chemical, biological, and biogeochemical systems.
Heat treatment was the master variable in SBE regeneration.
Although flow is commonly referred to as the master variable in environmental flows, geomorphology mediates the effects of flow regime on ecological processes.
Most enterprises scored considerably well in the master variable 'activity'activity
The mission statements of NRE-SEs and NRE-CEs show differences for the master variable 'optimism'optimism
The DICTION scores reveal another interesting fact that two out of ten NRE-SEs, and two out of ten NRE-CEs, score outside the range in the master variable 'Activity'; both NRE-SEs and one NRE-CE scoring low, and the other NRE-CE scoring high.
Thus, it is concluded that sorptive behavior (parametrized here using either KOW or KOC) is the master variable governing not only partitioning into sludge but also accumulation and persistence of organic pollutants in this matrix during wastewater treatment and solids digestion.
Despite increasing knowledge on the spatio-temporal dynamics of river temperature, a master water quality variable, it remains a challenge to identify the landscape variables influencing thermal heterogeneity along entire river courses.
