Compara mètodes

	Test de Durbin-Watson per a l'autocorrelació	Mínims Quadrats Generalitzats (GLS)
Camp	Econometria	Estadística
Família	Regression model	Regression model
Any d'origen	1950	1935
Autor original	James Durbin & Geoffrey Watson	Alexander Craig Aitken
Tipus	Test for first-order residual autocorrelation	Linear estimator
Font seminal	Durbin, J., & Watson, G. S. (1950). Testing for serial correlation in least squares regression: I. Biometrika, 37(3/4), 409–428.	Aitken, A. C. (1935). IV.—On least squares and linear combination of observations. Proceedings of the Royal Society of Edinburgh, 55, 42–48.
Àlies	DW test, Durbin-Watson statistic, Durbin-Watson otokorelasyon testi	GLS, Aitken estimator, EGLS, feasible GLS
Relacionats	4	3
Resum	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.	Generalized Least Squares (GLS) is a linear regression estimator that extends ordinary least squares to handle situations where the error terms are correlated or have non-constant variance (heteroscedasticity). Introduced by Alexander Craig Aitken in 1935, GLS achieves the Best Linear Unbiased Estimator (BLUE) under a general error covariance structure by weighting observations according to their precision, providing a theoretical bridge between OLS and modern linear mixed models.