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http://www.stat.columbia.edu/~gelman/blog/
January 25, 2005
Why I don't use the term "fixed and random effects"

冒頭部分
People are always asking me if I want to use a fixed or random effects model for this or that. I always reply that these terms have no agreed-upon definition. People with their own favorite definition of "fixed and random effects" don't always realize that other definitions are out there. Worse, people conflate different definitions.