The outer
lattice shows the distribution of companies according to the dimension Internal.
Each one of the three external nodes at the intermediate level focuses on a particular
value of Internal. For example (see the node in the middle), 110 enterprises have
Figure 5. Nested-line diagram from a subset of attributes in Table 1a
Toward Integrating Data Warehousing with Data Mining Techniques 2
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Internal = 2 (i.e., the top management represents a proportion of 10 to 25% of the
board). A careful look at the inner lattice of the external LHS node allows to state
that when Internal = 3, good quality of governance (i.e., Govern = 3) tends to be
less frequent than in the case when Internal is equal to 1 or 2. In particular, a comparison
between the inner diagrams related to the extreme nodes (LHS for Internal
= 3 and RHS for Internal = 1) of the outer structure shows clearly that the quality
of governance is overall higher for Internal = 1 than for Internal = 3 (e.g., 24 enterprises
have Govern = 3 when Internal = 1 against 7 when Internal = 3).
The NLD in Figure 5 can be perceived as a rollup on the fact table depicted by
Table 1a when the dimension Duality is ignored. However, the structure embeds
multiple rollups since one can see at the same time aggregate values for one of
the two dimensions or for a combination of the two dimensions.
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