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CPS2099 Takatsugu Yoshioka et al.
               4.  Discussion and Conclusion
                   We  propose  RKM  with  NLPCA  which  combines  NLPCA  with  k-means
               clustering  to  observe  the  clusters  of  objects  in  data  including  categorical
               variables in a low-dimensional subspace. The proposed method can basically
               provide the estimations of component scores, clusters with their centroids,
               and loadings in the subspace and reproduce the low-dimensional structure
               well.
                   We have to investigate the performance in detail, for examples, how the
               proposed method behaves for more complex date and how to avoid a local
               minima problem, and compare the proposed method with other methods in
               previous studies.

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