The phrase "an essential variable in" is correct and usable in written English.
It can be used when discussing a crucial factor or element that plays a significant role in a particular context or situation.
Example: "In the study of climate change, carbon emissions are an essential variable in understanding global warming trends."
Alternatives: "a key factor in" or "a critical element in".
Investment is an essential variable in the oil sector.
Giuliano Amato, a canny centre-left politician who served as prime minister in the early 1990s and again in 2000-01, observes that "timing is an essential variable in economic matters".
This lack of integration is clearly depicted by the absence of works that address prices in agent-based models (ABM), despite being considered an essential variable in markets.1.1
Place is an essential variable in determining disparities between different populations [ 1, 7].
From a theoretical point of view, data confirmed the importance of considering the characteristics of the task as an essential variable in interpreting working memory functions.
16 A study by Bukhari et al reported that a high RF titre is an essential variable in forecasting radiographic damage during the first 5 years after presenting with inflammatory polyarthritis.
27 Measuring physical fitness as a health indicator similar to BMI and waist circumference constitutes an essential variable to be monitored in order to analyse and understand the secular trends and the evolution of risks for metabolic and cardiovascular disease.
However, with the training load playing a key role for RRI development, the number of completed kilometers becomes an essential variable that must be included in the definition of running experience.
On the other hand, the forming force in SPIF is an essential variable, especially for the design of dedicated equipment or for the safe use of adapted machinery.
The most essential variable in strategy training might be the time factor; much time would be needed to achieve more significant results on the effect of SBI on language learning and EI ability.
While learning basic assessment skills, students are introduced to PVS components as essential variables in assessing patients holistically.
