In their study of the effectiveness of cardiac catheterization, McClellan, McNeil, and Newhouse (1994) used as an
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In their study of the effectiveness of cardiac catheterization, McClellan, McNeil, and Newhouse (1994) used as an instrument the difference in distances to cardiac catheterization and regular hospitals. How could you determine whether this instrument is relevant? How could you determine whether this instrument is exogenous?
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