The phrase "a key variable for" is correct and usable in written English.
It can be used when discussing an important factor or element that influences or contributes to a particular outcome or situation.
Example: "In this study, temperature is identified as a key variable for the growth of the plants."
Alternatives: "a crucial factor for" or "an essential element for".
As the BIS says: "Potential output is a key variable for policymakers.
"For Beijing city, a key variable for determining smog levels is VOCs," said Deborah Seligsohn, China climate program director for the World Resources Institute.
This is a key variable for the measurement of the size of the firm.
It is also a key variable for the optimization and the control of the underlying process.
As mentioned earlier, a key variable for calculating the traded quantities of illicit drugs in Bogota are seizures.
ULC is also a key variable for estimating the New Keynesian price equation (Galí and Gertler 1999; Sbordone 2002).
Land surface phenology is a key variables for modelling of the terrestrial ecosystems in a global change perspective and as such as input into circulation models (GCM's) [ 1].
While this provides further compelling evidence that tumour biology is a key variable required for decision making in personalised BC management, the heterogeneity within these groups and its incorporation with the currently validated variables and prognostic indices add complexity.
Control breaks occur when a key variable changes it value; for example, when creating a report from a file of customers' orders, a control break could occur when the program reaches a different customer's orders.
Informal care also plays a crucial role, as the support provided by informal caregivers is a key variable in determining whether and for how long the chronically ill will be institutionalised [ 35].
Learner perception presents a key variable influencing the role of WCF for two major reasons.
