Σύγκριση μεθόδων

	Δοκιμή KPSS σε Πάνελ (Δοκιμή Στάσιμης Σειράς Hadri Panel)	Δοκιμή μονάδικης ρίζας με δομικό σχίσμα Panel Zivot-Andrews
Πεδίο	Οικονομετρία	Οικονομετρία
Οικογένεια	Regression model	Regression model
Έτος προέλευσης	2000	1992 (panel extension: 2000s)
Δημιουργός	Hadri (2000), extending Kwiatkowski, Phillips, Schmidt, and Shin (1992)	Zivot & Andrews (1992); extended to panel settings by subsequent literature
Τύπος	Panel stationarity test	Unit root test with endogenous structural break
Θεμελιώδης πηγή	Hadri, K. (2000). Testing for stationarity in heterogeneous panel data. Econometrics Journal, 3(2), 148-161.	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.
Εναλλακτικές ονομασίες	KPSS panel stationarity test, panel stationarity test, Hadri LM test, panel KPSS	panel ZA test, panel structural break unit root test, Zivot-Andrews panel unit root test, panel endogenous break unit root test
Συναφείς	6	6
Σύνοψη	The Panel KPSS test, introduced by Hadri (2000), tests the null hypothesis that all series in a panel are stationary against the alternative that some or all contain a unit root. It extends the univariate KPSS framework to panel data by aggregating individual LM statistics, providing higher power than unit-root tests when most series are in fact stationary.	The Panel Zivot-Andrews test extends the single-series Zivot-Andrews (1992) structural break unit root test to panel data, allowing each cross-sectional unit to have its own endogenously determined break date. It tests the null of a unit root against the alternative of stationarity with a one-time structural break, accounting for regime shifts that bias standard panel unit root tests toward false non-rejection.