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 Levels
A term that indicates a greater than average quantity, intensity, or degree in a given context.
Team Sports
Sports that involve players working together towards a common objective, typically involving competitive play against another team.
Organized Sports
structured physical activities, usually competitive, that are governed by a set of rules and organized by leagues, clubs, or associations.
Middle Childhood
A developmental stage that encompasses the period from around 6 to 12 years of age, when children are typically in elementary school.
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