R ating Based Modeling of Credit Risk Theory and Application of Migration Matrices Contents Preface xi 1 Introduction: Credit Risk Modeling, Ratings, a nd Migration Matrices ...

Under the symmetric á-stable distributional assumption for the disturbances, Blattberg et al (1971) consider unbiased linear estimators for a regression model with non-stochastic regressors. We consider both the rate of convergence to the true value and the asymptotic distribution of the...