Ng and Perron (Econometrica 69:1519–1554, 2001) demonstrated the merits to employing their Modified Akaike Information Criterion to select the optimal lag length in the Elliott, Rothenberg and Stock (Econometrica 64:813–836, 1996) unit rot test. Perron and Qu (Econ Lett 84:12–19, 2007) introduced an empirical method that resolved an associated power problem for non-local alternatives. While Cheung and Lai (Oxford Bull Econ Stat 57:411-419, 1995) contains response surface estimates to generate finite-sample, lag-adjusted critical five and ten percent values for use in applied work, these relate to the original Elliott et al. (Econometrica 64:813–836, 1996) test. This paper provides response surfaces estimates of critical values for both the Ng and Perron (Econometrica 69:1519–1554, 2001) and Perron and Qu (Econ Lett 84:12–19, 2007) approaches, demonstrating they are sometimes quite different, an important consideration when performing inference.

Ng和Perron（Econometrica 69：1519–1554，2001）证明了在Elliott，Rothenberg和Stock（Econometrica 64：813–836，1996）单位腐烂测试中采用改进的Akaike信息准则选择最佳滞后长度的优点。Perron和Qu（Econ Lett 84：12-19，2007）引入了一种经验方法，该方法解决了非本地替代方案的相关功率问题。尽管Cheung和Lai（Oxford Bull Econ Stat 57：411-419，1995）包含响应面估计以生成有限样本，经滞后调整的5％和10％临界值以用于应用工作，但这些与原始Elliott等有关。（Econometrica 64：813–836，1996）测试。本文提供了Ng和Perron（Econometrica 69：1519-1554，2001）和Perron和Qu（Econ Lett 84：12-19，2007）方法的临界值的响应面估计，