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shaohuan
2009 Nov 13
0
about the pgmm in plm package (application and singularity)
Dear Sir or Madam:
I am Shaojuan Liao, the 3rd year Ph.D. student from Econ Department,
Virginia Tech.
I don't know whether it is appropriate to ask you questions on the
command pgmm. But I don't know how to deal with the case where all X are
exogenous and all T time periods' X can be used as the instrument.
Proble...