เปรียบเทียบวิธี

	กำลังสองน้อยที่สุดแบบทั่วไป (Generalized Least Squares - GLS)	การถดถอยกำลังสองน้อยที่สุดสามัญ (OLS)	การวิเคราะห์กำลังสองน้อยที่สุดแบบถ่วงน้ำหนัก (WLS)
สาขาวิชา	สถิติศาสตร์	เศรษฐมิติ	สถิติศาสตร์
ตระกูล	Regression model	Regression model	Regression model
ปีกำเนิด	1935	2019	1935
ผู้ริเริ่ม	Alexander Craig Aitken	Wooldridge (textbook treatment); classical least squares	Alexander Craig Aitken
ประเภท	Linear estimator	Linear regression	Weighted linear estimator
แหล่งต้นตำรับ	Aitken, A. C. (1935). IV.—On least squares and linear combination of observations. Proceedings of the Royal Society of Edinburgh, 55, 42–48.	Wooldridge, J. M. (2019). Introductory Econometrics: A Modern Approach (7th ed.). Cengage Learning. ISBN: 978-1337558860	Aitken, A. C. (1935). IV.—On least squares and linear combination of observations. Proceedings of the Royal Society of Edinburgh, 55, 42–48.
ชื่อเรียกอื่น	GLS, Aitken estimator, EGLS, feasible GLS	ordinary least squares, classical linear regression, linear regression, en küçük kareler regresyonu	WLS, weighted regression, heteroscedasticity-corrected OLS, variance-weighted least squares
ที่เกี่ยวข้อง	3	5	3
สรุป	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.	Ordinary Least Squares is the classical linear regression method that explains a continuous outcome as a linear combination of predictors. It estimates the coefficients by minimising the sum of squared residuals, and under the Gauss-Markov assumptions these estimates are the best linear unbiased estimator (BLUE).	Weighted Least Squares is a generalization of Ordinary Least Squares (OLS) regression that assigns each observation a weight inversely proportional to its error variance, thereby down-weighting high-variance data points and up-weighting precise ones. Introduced in its general matrix form by Alexander Craig Aitken in 1935, WLS is the canonical remedy when heteroscedasticity is present and the error variance structure is known or can be reliably estimated.