Improved algorithm for calculating contributions to <Emphasis Type="Italic">D</Emphasis>-statistic |
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Authors: | Hao Wu Hao Ye Yi-ming Wan |
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Institution: | 1.Department of Automation,Tsinghua University,Beijing,China |
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Abstract: | D-statistic contribution analysis has been frequently used in practice for fault diagnosis. Existing algorithms for computing
contributions to D-statistic tend to distribute cross-term contribution equally between two correlated variables. This leads to increased variance
in contribution estimation and hence poor separability of faulty and normal variables. A new method for contribution calculation
to D-statistic is proposed here which introduces a weighting scheme capable of distinguishing the contributions of two correlated
variables. Simulation examples show that the proposed approach achieves improved resolution for distinguishing faulty and
normal conditions. |
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