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Estimation in a duration model for evaluating educational programs
Brännäs, Kurt, (2000)
Comment on James J. Heckman, "Instrumental variables: a study of implicit behavioral assumptions used in making program evaluations"
Angrist, Joshua D., (1999)
The relationship between parameters within a latent variable framework
Heckman, James J., (2000)
Are local TV markets separate markets?
Ekelund, Robert B., (2000)
Preserving free television? : Some empirical evidence on the efficacy of must-carry
Ford, George S., (2000)
Horizontal concentration and vertical integration in the cable television industry
Ford, George S., (1997)