Andrews, Donald W. K.; Li, Ming - In: Quantitative economics : QE ; journal of the … 16 (2025) 3, pp. 823-858
transitions between the two. The estimation of the AR parameter at any time point is based on a local least squares regression … method, where the relevant initial condition is endogenous. We obtain limit distributions for the AR parameter estimator and … t-statistic at a given point τ in time when the parameter exhibits unit root, local-to-unity, or stationary …