In their 2001 paper, Breuer, McNown, and Wallace argue that panel unit root tests are flawed in that the “all or nothing nature of these procedures may lead to serious misinterpretations of tests applied to mixed panels” (2001, p. 483). The authors propose an alternative test, the SURADF...

In an effort to resolve the "all or nothing" nature of panel unit root tests, Professors Boucher-Breuer, McNown and Wallace propose the SURADF test that can determine the mix of stationary and non-stationary series in a panel. We reveal a practical shortcoming of the test. Specifically, the...