One solution is to specify "individuals" rather than "nations" as the panel
ID. To capture the information contained in the variation across nations,
you can create country dummies.
Best
Ralph
Dr. Ralph Heinrich
Economic Affairs Officer
Economic Analysis Division
UN Economic Commission for Europe
room 441
Palais des Nations
1211 Geneva 10
phone: 0041 22 917 1269
http://www.unece.org/ead/ead_h.htm
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