পদ্ধতির তুলনা করুন

	শক্তিশালী অগমেন্টেড ডিকি-ফুলার ইউনিট রুট পরীক্ষা	অগমেন্টেড ডিকি-ফুলার (ADF) ইউনিট রুট পরীক্ষা
ক্ষেত্র	অর্থমিতি	অর্থমিতি
পরিবার	Regression model	Regression model
উদ্ভবের বছর	1996-2001	1979–1984
প্রবর্তক	Ng and Perron (2001); Elliott, Rothenberg, and Stock (1996)	Said & Dickey (1984); building on Dickey & Fuller (1979)
ধরন	Unit root / stationarity test	Hypothesis test (unit root)
মৌলিক উৎস	Ng, S., and Perron, P. (2001). Lag length selection and the construction of unit root tests with good size and power. Econometrica, 69(6), 1519-1554.	Said, S. E., & Dickey, D. A. (1984). Testing for unit roots in autoregressive-moving average models of unknown order. Biometrika, 71(3), 599–607.
অপর নাম	robust ADF test, HAC-corrected ADF, heteroscedasticity-robust unit root test, GLS-detrended ADF	ADF test, ADF unit root test, Dickey-Fuller test (augmented), Said-Dickey test
সম্পর্কিত	6	5
সারসংক্ষেপ	The Robust ADF unit root test extends the classical ADF procedure with improvements that correct for size distortions arising from heteroscedastic or serially correlated errors, and from poor lag-length selection. Drawing on GLS detrending (Elliott, Rothenberg, and Stock 1996) and modified information criteria (Ng and Perron 2001), it delivers reliable size and power in the presence of non-standard error processes common in macroeconomic and financial time series.	The Augmented Dickey-Fuller test is the standard procedure for determining whether a univariate time series contains a unit root — that is, whether the series is non-stationary. It extends the original Dickey-Fuller test by including lagged difference terms that absorb serial correlation in the residuals, making the test valid for a wide range of time-series processes encountered in economics and finance.