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• W2097583558 abstract "A new technique is considered for parameter estimation in a linear measurement error model AX≈B, A=A0+A˜, B=B0+B˜, A0X0=B0 with row-wise independent and non-identically distributed measurement errors A˜, B˜. Here, A0 and B0 are the true values of the measurements A and B, and X0 is the true value of the parameter X. The total least-squares method yields an inconsistent estimate of the parameter in this case. Modified total least-squares problem, called element-wise weighted total least-squares, is formulated so that it provides a consistent estimator, i.e., the estimate X^ converges to the true value X0 as the number of measurements increases. The new estimator is a solution of an optimization problem with the parameter estimate X^ and the correction ΔD=[ΔAΔB], applied to the measured data D=[AB], as decision variables. An equivalent unconstrained problem is derived by minimizing analytically over the correction ΔD, and an iterative algorithm for its solution, based on the first order optimality condition, is proposed. The algorithm is locally convergent with linear convergence rate. For large sample size the convergence rate tends to quadratic." @default.
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• W2097583558 date "2006-01-01" @default.
• W2097583558 modified "2023-10-16" @default.
• W2097583558 title "The element-wise weighted total least-squares problem" @default.
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• W2097583558 doi "https://doi.org/10.1016/j.csda.2004.07.014" @default.
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