Compară metode

	Testul Q Ljung-Box pentru autocorelare	Modelul ARIMA (Autoregresiv Integrat cu Medii Mobile)	Testul Durbin-Watson pentru Autocorelație
Domeniu	Econometrie	Econometrie	Econometrie
Familie	Hypothesis test	Regression model	Regression model
Anul apariției	1978	2015	1950
Autorul original	Greta Ljung & George Box	Box & Jenkins (Box-Jenkins methodology)	James Durbin & Geoffrey Watson
Tip	Portmanteau goodness-of-fit test	Univariate time-series model	Test for first-order residual autocorrelation
Sursa seminală	Ljung, G. M., & Box, G. E. P. (1978). On a measure of lack of fit in time series models. Biometrika, 65(2), 297–303.	Box, G. E. P., Jenkins, G. M., Reinsel, G. C. & Ljung, G. M. (2015). Time Series Analysis: Forecasting and Control (5th ed.). Wiley. ISBN: 978-1118675021	Durbin, J., & Watson, G. S. (1950). Testing for serial correlation in least squares regression: I. Biometrika, 37(3/4), 409–428.
Denumiri alternative	Ljung-Box Q Test, Modified Box-Pierce Test, Portmanteau Test for Autocorrelation, Otokorelasyon Portmanteau Testi	Box-Jenkins model, ARIMA(p,d,q), ARIMA Modeli	DW test, Durbin-Watson statistic, Durbin-Watson otokorelasyon testi
Înrudite	3	5	4
Rezumat	The Ljung-Box Q test is a diagnostic portmanteau test proposed by Ljung and Box (1978) to assess whether a group of autocorrelations in a time series residual sequence is jointly zero. It is widely used to evaluate the adequacy of fitted time series models — especially ARIMA models — by testing whether remaining residuals exhibit any systematic pattern. The test is applicable in econometrics, finance, and any field that relies on temporal data modeling.	ARIMA is a univariate time-series forecasting model that combines autoregressive, integrated (differencing), and moving-average components to predict a single continuous series from its own past. It is the centrepiece of the Box-Jenkins methodology set out in Box, Jenkins, Reinsel & Ljung's Time Series Analysis (5th ed., 2015).	The Durbin-Watson test, developed by James Durbin and Geoffrey Watson in 1950–1951, detects first-order serial correlation in the residuals of a linear regression. Its statistic ranges from 0 to 4, with a value near 2 indicating no autocorrelation, values toward 0 indicating positive autocorrelation, and values toward 4 indicating negative autocorrelation. It remains one of the most reported regression diagnostics despite well-known limitations.