Augmenting a first-order dynamic regression model by adding particular redundant regressors gives a least-squares estimator of the lagged-dependent variable coefficient that is independent of nuisance parameters under a null hypothesis. This estimator and its t ratio have finite sample null...

In a single-equation error correction model, two alternative formulations of a linear hypothesis on the long-run parameters and associated Wald test statistics are shown to arise from the covariance matrix estimator. A choice between the statistics is based on invariance properties and on lack...

We discuss a method to estimate the confidence bounds for average economic growth, which is robust to misspecification of the unit root property of a given time series. We derive asymptotic theory for the consequences of such misspecification. Our empirical method amounts to an implementation of...