- *-SYSGMM: Arellano and Bover (1995), BB1998
- xi: xtdpdsys F.$y $xx i.year, maxlags(5) maxldep(5)
- . xi: xtdpdsys F.$y $xx i.year, maxlags(5) maxldep(5)
- i.year _Iyear_1950-2013 (naturally coded; _Iyear_1950 omitted)
- note: _Iyear_1952 dropped because of collinearity
- _xtdpd_putlevinst(): 3301 subscript invalid
- _xtdpd_mkzlev(): - function returned error
- _xtdpd_dowork(): - function returned error
- <istmt>: - function returned error
_xtdpd_mkzlev(): - function returned error
_xtdpd_dowork(): - function returned error
<istmt>: - function returned error


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