The paper derives the family of double k-class estimators (Ullah and Ullah, 1978) as a subset of the mixture-type two-stage hierarchial-information (2SHI) estimators (Tran Van Hoa, 1985) in the general linear regression model, and provides a formal justification for the double k-class estimators...

Reparameterization is common in econometrics with early examples in the form of Koyck transformations that started in the 1950s. Reparameterization can produce interesting models for estimation and inference. The paper specifically looks at reparameterization in unit root equations, and provides...