Journal of The Japanese Society for Quality Control
Online ISSN : 2432-1044
Print ISSN : 0386-8230
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Volume 33, Issue 4
Displaying 1-9 of 9 articles from this issue
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Features
Contributed Paper
  • On Contermeasures against Multicollinearity in Mahalanobis - Taguchi System
    Masami MIYAKAWA, Yasushi NAGATA
    Article type: Contributed Paper
    2003 Volume 33 Issue 4 Pages 467-475
    Published: October 15, 2003
    Released on J-STAGE: June 15, 2018
    DOIhttps://doi.org/10.20684/quality.33.4_467
    JOURNAL RESTRICTED ACCESS
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    The Mahalanobis-Taguchi system (MTS) is a new collection of methods for diagnosis and forecasting using multivariate data. A number of case studies using MTS have been published. However, there remain some unsolved problems about MTS. One of these problems is a countermeasure against multicollinearity. This paper deals with this subject. Firstly, we point out the theoretical defect of MTA which is a countermeasure applied in MTS. Secondly, we propose two distances in place of MTA. Furthermore, we pay attention to the numerical calculation in MTS and the bias of Mahalanobis distance for future item from the "normal" group.
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Technical Note
  • Statistical Test of Signal-to-Noise Ratio for Binary Input-Output System
    Masami MIYAKAWA
    Article type: Technical Note
    2003 Volume 33 Issue 4 Pages 476-481
    Published: October 15, 2003
    Released on J-STAGE: June 15, 2018
    DOIhttps://doi.org/10.20684/quality.33.4_476
    JOURNAL RESTRICTED ACCESS
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    In Taguchi method, several signal-to-noise ratios are utilized in order to evaluate the performance of system. In this paper, statistical tests of the equality of signal-to-noise ratios for two kinds of binary input-output systems having the same objective function are discussed. It is shown that the problem is equivalent to the test of the equality for two odds ratios between two 2×2 contingency tables. The problem is formulated through the log-linear model for three-way contingency table. As a result, simple procedures whose sizes are close to the nominal level are exhibited.
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