(Data file: UN11) Verify that in the regression log(fertility) ∼ log(ppgdp) + lifeExpF a 25% increase in ppgdp is associated with a 1.4% decrease in expected fertility
Suppose we fit a regression with the true mean function
Provide conditions under which the mean function for E(Y|X1= x1) is linear but has a negative coefficient for x1.
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