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which type of function best models the data in each table use differences or ratios, If this number is < 0.05 then your model is ok. This is a test (F) to see whether all the coefficients in the model are different than zero. In terms of income per head, America is the wealthiest large industrial country. It is also the only western democracy to have practised slavery in the industrial era. It has the highest crime rate and highest rate of imprisonment (though crime, at least, is falling towards European levels).