DATA7-8:  Cross-country data for economic growth and its determinants.
    Data are from Mankiw, Romer and Weil, QJE 1992
    grth  = log of change in income 1960-85 (dependent variable)
    y60   = log of income in 1960
    inv   = average investment to GNP ratio over 60-85
    pop   = measure of population growth in logarithms
    school= measure of percentage population in school
    dn    = dummy for non oil
    di    = dummy for industrialised
    doecd = dummy for OECD

SAMPLE 1 104
READ (DATA7-8) grth y60 inv pop school dn di doecd