Regression as an Executive Tool

	Group mean		Individual
	Interpolate	Extrapolate	Interpolate	Extrapolate
Predict	Most Reliable
Select
Influence
Credit & Blame				Least Reliable

"Insight" = the ability to do these informally in conjunction with other kinds of evidence in a larger context.

Confidence interval for a group mean versus prediction interval for an individual
    "Credit & Blame"

Multicollinearity and the relative importance of variables
    As you move down the table above, multicollinearity becomes more and more of an issue.