This data frame contains 75 obs. of 11 variables:
x1: num, gross national product per capita.
x2: num, consumption per capita.
x3: num, percentage of the labor force in industrial occupations.
y1: num, freedom of the press in 1960.
y2: num, freedom of group opposition in 1960.
y3: num, fairness of elections in 1960.
y4: num, elective nature and effectiveness of the legislative body in 1960.
y5: num, freedom of the press in 1965.
y6: num, freedom of group opposition in 1965.
y7: num, fairness of elections in 1965.
y8: num, elective nature and effectiveness of the legislative body in 1965.