Truncated Normal, Econometrica 42 (Nov. 1974), 999-1011. Dagenais, Marcel, Application of a Threshold Regression Model to Household Purchases of Automobiles, this REVIEW 57 (Aug. 1975), 275-285. Goldfeld, Stephen, and Richard Quandt, Estimation in a Disequilibrium Model and the Value of Information, Journal of Econometrics 3 (1975), 325-348. Hausman, Jerry, and David Wise, Evaluation of Results from Truncated Samples: The New Jersey Income Maintenance Experiment, Annals of Economic and Measurement 5 (1976), 421-445. , Social Experimentation, Truncated Distributions, and Efficient Estimation, Econometrica 45 (May 1977), 919-938. Heckman, James, Shadow Prices, Market Wages, and Labor Supply, Econometrica 42 (July 1974), 679694. , Common Structure of Statistical Models of Truncation, Sample Selection, and Limited Dependent Variables and a Simple Estimator for Such Models, Annals of Economic and Measurement 5 (1976), 475-492. Keeley, Michael, Philip Robins, Robert Spiegelman, and Richard West, Labor Supply Effects and Costs of Alternative Negative Income Tax Programs, Journal of Human Resources 13 (Winter 1978), 3-36. Nelson, Forrest, Censored Regression Models with Unobserved, Stochastic Censoring Thresholds, Journal of Econometrics 6 (1977), 309-327. Rosen, Harvey, Taxes in a Labor Supply Model with Joint Wage-Hours Determination, Econometrica 44 (May 1976), 485-507. Rosett, Richard, and Forrest Nelson, Estimation of the Two-Limit Probit Regression Model, Econometrica 43 (Jan. 1975), 141-146. Shishko, Robert, and Bernard Rostker, Economics of Multiple Job Holding, American Economic Review 66 (June 1976), 298-308. Tobin, James, Estimation of Relationships for Limited Dependent Variables, Econometrica 26 (Jan. 1958), 24-36.