i) What does it mean to say that the fixed effect varies cross sectionally by not over time?
i) What does it mean to say that the fixed effect varies cross sectionally by not over time?
Linear Algebra: A Modern Introduction
4th Edition
ISBN:9781285463247
Author:David Poole
Publisher:David Poole
Chapter7: Distance And Approximation
Section7.3: Least Squares Approximation
Problem 31EQ
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