Minimum LM unit root test with one structural break

In this paper, we consider the minimum Lagrange Multiplier (LM) unit root test with one structural break in intercept and trend. This paper complements the earlier work of Lee and Strazicich (2003), who consider the minimum LM unit root test with two breaks. The asymptotic properties are derived, critical values are provided, and size and power properties are examined. The one-break minimum LM unit root test is valid in the presence of a break under the null and alternative hypotheses and is free of spurious rejections.