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A panel of 18 observations from 1960 to 1978
A data frame containing :
a factor with 18 levels
the year
logarithm of motor gasoline consumption per car
logarithm of real per-capita income
logarithm of real motor gasoline price
logarithm of the stock of cars per capita
total number of observations : 342
observation : country
country : OECD
BALT:01plm
BALT:13plm
BALT:GRIF:83plm