Why do data need to be adjusted?

For consistency across units

      For consistency in currency

          Revenues in dollars, pounds sterling and yen mean different things at different times

          Need to have non-volitile comparisons

      For differences in management, operational and legal structures of a company

         All activities under a "vice president"

         Consistent definitions of independence

      For differences in the source data

          Identification of product

      To provide additional dimensions of data (such as vertical markets, television advertising regions or demographic characteristics).

          Identify all independent warehouses

          Identify all activities with production, marketing and sales of Widgets

Timing: You want to know when data are updated for consistency

          Identify end of month measures regardless of when data are entered

History: You want to include variables that define "time" for analysis

         Associate a date for each decision

Summaries: Often summary data are included for quick analysis

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