Miscellanea. Bartlett correction of the unit root test in autoregressive models
自回归模型单位根检验的 Bartlett 修正
The usual conditions for a Bartlett correction are not fulfilled when testing for a unit root in a Gaussian autoregressive model. However, by expanding the moments of the likelihood ratio statistic it can be shown that the Bartlett correction improves the asymptotic distribution approximation.