
A LQDRKHSbased distributiontodistribution regression method and its application to restore distributions of missing SHM data
Data loss is a critical problem in structural health monitoring (SHM). P...
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LQDRKHSbased distributiontodistribution regression methodology for restoring the probability distributions of missing SHM data
Data loss is a critical problem in structural health monitoring (SHM). Probability distributions play a highly important role in many applications. Improving the quality of distribution estimations made using incomplete samples is highly important. Missing samples can be compensated for by applying conventional missing data restoration methods; however, ensuring that restored samples roughly follow underlying distributions of true missing data remains a challenge. Another strategy involves directly restoring the probability density function (PDF) for a sensor when samples are missing by leveraging distribution information from another sensor with complete data using distribution regression techniques; existing methods include the conventional distributiontodistribution regression (DDR) and distributiontowarping function regression (DWR) methods. Due to constraints on PDFs and warping functions, the regression functions of both methods are estimated from the NadarayaWatson kernel estimator with relatively low degrees of precision. This article proposes a new indirect distributiontodistribution regression method in the context of functional data analysis for restoring distributions of missing SHM data. PDFs are transformed to ordinary functions residing in a Hilbert space via the newly proposed logquantiledensity (LQD) transformation; the regression for distributions is realized in the transformed space via a functional regression model constructed based on the theory of Reproducing Kernel Hilbert Space (RKHS), corresponding result is subsequently mapped back to the density space through the inverse LQD transformation. Test results using field monitoring data indicate that the new method significantly outperforms conventional methods in general cases; however, in extrapolation cases, the new method is inferior to the distributiontowarping function regression method.
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