قارن الطرق

	اختبار جذر الوحدة لـ Lee-Strazicich مع كسرين هيكليين	اختبار جذر الوحدة لـ Zivot-Andrews مع كسر هيكلي واحد
المجال	الاقتصاد القياسي	الاقتصاد القياسي
العائلة	Hypothesis test	Hypothesis test
سنة النشأة	2003	1992
صاحب الطريقة	Junsoo Lee & Mark Strazicich	Eric Zivot & Donald Andrews
النوع	Lagrange Multiplier unit-root test with two endogenous structural breaks	Sequential unit-root test with endogenous break-point selection
المصدر التأسيسي	Lee, J., & Strazicich, M. C. (2003). Minimum Lagrange multiplier unit root test with two structural breaks. Review of Economics and Statistics, 85(4), 1082–1089.	Zivot, E., & Andrews, D. W. K. (1992). Further evidence on the great crash, the oil-price shock, and the unit-root hypothesis. Journal of Business & Economic Statistics, 10(3), 251–270.
الأسماء البديلة	LS Unit Root Test, Minimum LM Unit Root Test, Lee-Strazicich Two-Break Test, Lee-Strazicich LM Testi	ZA Test, Zivot-Andrews Break Test, Endogenous Break Unit-Root Test, Zivot-Andrews Birim Kök Testi
ذات صلة	3	3
الملخص	The Lee-Strazicich (2003) test is a Lagrange Multiplier-based unit-root test that allows for two endogenous structural breaks under both the null and alternative hypotheses. Proposed by Junsoo Lee and Mark C. Strazicich, it corrects a fundamental flaw in earlier break-based tests such as Zivot-Andrews, where structural breaks were permitted only under the alternative. By incorporating breaks under the null, the LS test avoids spurious rejections and provides size-correct inference in the presence of level or trend shifts.	The Zivot-Andrews (ZA) test, introduced by Eric Zivot and Donald Andrews in 1992, is a sequential unit-root test that allows for a single structural break at an unknown date. It extends the augmented Dickey-Fuller framework by endogenously selecting the break point that provides the strongest evidence against the unit-root null hypothesis, making it particularly useful for macroeconomic and financial time series that may have been disrupted by events such as policy changes, financial crises, or supply shocks.