To test for unit roots in panel data, Levin, Lin and Chu (2002) develop a test based on the equation . What is the appropriate null hypothesis for this test? 
Definitions:
High Job Performance
The degree to which an employee excels in fulfilling their job responsibilities and tasks to a high standard.
Vocational Fit
The degree to which an individual's interests, abilities, and values align with a chosen career or occupation.
Personality Questionnaire
A tool or test designed to assess and measure various aspects of an individual's personality traits and characteristics.
Vocational Interests
Personal preferences and inclinations towards certain professions or occupational activities.
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