Budget Amount *help 
¥1,500,000 (Direct Cost : ¥1,500,000)
Fiscal Year 1992 : ¥600,000 (Direct Cost : ¥600,000)
Fiscal Year 1991 : ¥900,000 (Direct Cost : ¥900,000)

Research Abstract 
In the binary regression model where the response probability function F is fixed but arbitrary, we showed that mle is not robust in most cases such as probit and logic. We thus constructed a class of robust Mestimates which also turn out to be robust when there exists the specification error in the form of F. We discussed the logic model in detail since it has some advantages over other models. In a forthcoming paper entitled "Robust Estimation of the Binary Regression Model,"the following problems are discussed. 1. We find a class of Mestimates which are robust against the specification errors in the functional form of F, assuming arbitrary F as the true model, and investigate their properties. 2. We then introduce the coding error model which describes the plausible errors in the binary regression model. Our Mestimate is also robust against this kind of errors. 3. Finally, we give the Mestimate which is qualitatively robust against specification errors in F, and at the same time, is consistent and asymptotically efficient at the true model. A further topic is that when there exist both observation errors and the specification error, then no estimate can be consistent(the concept is clearly defined in the paper). Hence we must depend on some adaptive methods of estimating response probability without assuming a rigid form of F, as the final solution to the estimation of the binary regression model. The author has proposed a Bayesian method towards this direction.
