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Article information
2017 , Volume 22, ¹ 2, p.150-172
Shary S.P.
Strong compatibility in data fitting problem under interval data uncertainty
The data fitting problem is a popular and practically important problem in which a functional dependency between “input” and “output” variables is to be constructed from empirical data. At the same time, the measurements are almost always subject to uncertainties due to data inadequacy and errors in real-life situations. Traditionally, when processing the measurement results, models of probability theory are used, which is not always adequate to the problems under study. An alternative way to describe data inaccuracy is to use methods of interval analysis, based on specifying interval bounds of the measurement results. Data fitting problems under interval uncertainty are being solved for about half a century. Most studies in this field rely on the concept of compatibility between parameters and measurement data in which any measurement result is a kind of a large point “inflated” to a box (rectangular parallelepiped with facets parallel to the coordinate axes). The graph of the constructed function passing through such a “point” means a nonempty intersection of the graph with the box. However, in some problems, this natural concept turns out unsatisfactory. In this work, for the data fitting under interval uncertainty, we introduce the concept of strong compatibility between data and parameters. It is adequate to the situations when measurements of input and output variables are broken in time, and we strive to uniformly take into account the interval results of output measurements. The paper gives a practical interpretation of the new concept. It is shown that the modified formulation of the problem reduces to recognition and further estimation of the so-called tolerable solution set to interval systems of equations constructed from the processed data. We propose a computational technology for the solution of the data fitting problem under interval uncertainty that satisfies strong compatibility requirement. Finally, we consider generalizations of the concept of strong compatibility.
[full text]
Keywords: data fitting problem, compatibility between data and parameters, strong compatibility, interval system of linear equations, tolerable solution set, recognizing functional, convex nonsmooth optimization
Author(s):
Shary Sergey Petrovich
Dr. , Senior Scientist
Position: Leading research officer
Office: Federal Research Center for Information and Computational Technologies
Address: 630090, Russia, Novosibirsk, Ac. Lavrentiev ave, 6
Phone Office: (3832) 30 86 56
E-mail: shary@ict.nsc.ru
SPIN-code: 9938-9344 References:
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Bibliography link:
Shary S.P. Strong compatibility in data fitting problem under interval data uncertainty // Computational technologies. 2017. V. 22. ¹ 2. P. 150-172
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