(Requires some Calculus)Consider the sample regression function . 
.Take the total derivative.Next show that the partial derivative 
is obtained by holding 
constant,or controlling for 
.
Definitions:
Social Needs
Refers to the essential human requirements for belonging, love, and interaction with others.
Persistence
The quality of continuing steadfastly despite challenges or obstacles.
Motivation
The method that begins, directs, and sustains actions aimed at achieving objectives.
Process Theories
Refer to models and concepts that explain the dynamics of how processes, such as decision-making or motivation, unfold over time within organizations.
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