Dependent variable represents revenue. Number of obs = 617737
Group variable (i): id Number of groups = 284653
Time variable (t): year
Obs per group: min = 1
avg = 2.2
max = 5
是的~ levpet estimates production functions using intermediate inputs to
control for unobservable productivity shocks. The methodology is
described in Levinsohn and Petrin (2003) and Petrin, Poi, and Levinsohn
(2004). All variables are assumed to be in logarithms.
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