2003年 3月16日 A HIERARCHICAL STRUCTURE FOR SUBSETS BACK >> 目次



● A hierarchical structure for subsets

 If and when there are many "partition" codes in a set, you're expected to create a "hierarchical" structure of subsets fanned out by as many as the "partition" codes as noted below:

 Business Office:{BO-NO, BO-name, by location, by capital formation, ...}[ R ]
  |
  |
  × by location
  |
  |____ subsidiary abroad
  |
  |
  |____ domestic
           |
           |
           × by capital formation
           |
           |______ affiliated company
           |
           |______ joint capital


 A "hierarchical" structure of subsets represents a "inclusion relationship" (among subsets): a bigger includes a smaller.

 Among subsets, no "intersection (conjunction)" will ever be observed--there cannot be a person of both "man" and "woman." There ARE, however, in "real" data, subsets between/among which a conjunction may be observed, I'll take the conjunction next time.

 

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