The limiting distribution of the t-ratio for the unit root test in an AR(1)
AR(1) 单位根检验 t 比率的极限分布
We consider the limiting distribution of the t -statistic for testing the random walk hypothesis in the classical Gaussian AR(1) model. Abadir (1995, Econometric Theory, 11, 775�793) derived the first derives a closed (i.e. integration-free) expression for the limit-ing distribution function. This paper derives an alternative closed expression. Abadir�s and the new expression are valid only for negative arguments and each involve two infinite summa-tions. To enable a…