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A panel of 125 observations from 1960 to 1985
A data frame containing :
the year
the country name (factor)
OPEC member?
communist regime?
country's population (in thousands)
real GDP per capita (in 1985 US dollars)
saving rate (in percent)
total number of observations : 3250
observation : country
country : World
HAYA:00plm
SUMM:HEST:91plm