McKinley L. Blackburn has written:
'Are OLS estimates of the return to schooling biased downward?'
-- subject(s): Ability, Economic aspects, Economic aspects of
Ability, Effect of education on, Wages
'Unobserved ability, efficiency wages, and interindustry wage
differentials' -- subject(s): Wages, Ability
'Changes in earnings differentials in the 1980s' -- subject(s):
Wages, Statistics