Andyblg's Blog

July 1, 2009

Some words about measures and hierarchies

Filed under: DW — andyblg @ 13:12
Tags: ,

Measure – metrics used to analyze business performance

  • Additive
  1. can be summed across all dimensions
  2. sales dollars
  • Semi-additive
  1. cannot be summed across some dimensions
  2. bank account balance snapshots across time
  3. balance at the end of the month is not equal to the sum of daily balance
  • Non-additive
  1. cannot be summed across any dimensions
  2. account numbers, invoice numbers, cannot be summed, even if they are numeric

and

Hierarchies

  • Natural hierarchies contain attribute relationships between each pair of level

(Product category->Product subcategory->Product name)

  • Attribute hierarchies expose a single attribute

(Product name)

  • User hierarchies expose multiple levels, but do not include relationships between all attributes

(Gender->Income level)

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3 Comments »

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