Level with me

摘要

Let's be levelheaded about data mining simultaneously at many levels. (By "levels," I mean levels in a database hierarchy) Many businesses know that the massive data sets they collect can be mined for business gems of great value. But so much business data these days is hierarchical in nature - with dimensions, for example, depicting levels of time (year, month, and day), geography (country, state, and city), nested categories of customers, and different levels of detail in product descriptions.