PQMLPoisson Quasi-Maximum-Likelihood
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For level-exponential specifications, we also examine PQML estimator, and find the results are similar (reported in the separate appendix).
Because the recycling variable is also integer and suffers from under-dispersion the PQML is appropriate here also.
062) Fixed effect for source Volume Volume Volume Publication-year x citation-year Yes No No time effects Journal-specific quadratic age Yes Yes No profile Lagged citations No No Yes Notes: Results from Wooldridge's (1999) PQML procedure.