@article {15762,
	title = {Implicitly-weighted total least squares},
	journal = {Linear Algebra and its Applications},
	volume = {435},
	year = {2011},
	month = {2011/08/01/},
	pages = {560 - 577},
	abstract = {In a total least squares (TLS) problem, we estimate an optimal set of model parameters X , so that ( A - Δ A ) X = B - Δ B , where A is the model matrix, B is the observed data, and Δ A and Δ B are corresponding corrections. When B is a single vector, Rao (1997) and Paige and Strako{\v s} (2002) suggested formulating standard least squares problems, for which Δ A = 0 , and data least squares problems, for which Δ B = 0 , as weighted and scaled TLS problems. In this work we define an implicitly-weighted TLS formulation (ITLS) that reparameterizes these formulations to make computation easier. We derive asymptotic properties of the estimates as the number of rows in the problem approaches infinity, handling the rank-deficient case as well. We discuss the role of the ratio between the variances of errors in A and B in choosing an appropriate parameter in ITLS. We also propose methods for computing the family of solutions efficiently and for choosing the appropriate solution if the ratio of variances is unknown. We provide experimental results on the usefulness of the ITLS family of solutions.},
	keywords = {Data least squares, Errors in variables, least squares, Linear regression, total least squares, Variance estimation},
	isbn = {0024-3795},
	doi = {10.1016/j.laa.2010.06.020},
	url = {http://www.sciencedirect.com/science/article/pii/S0024379510003162},
	author = {Park,Sungwoo and O{\textquoteright}Leary,Dianne P.}
}
