SAS OLAP cubes organize
data in a hierarchical arrangement, according to dimensions and measures.
Dimensions group the data along natural categories and consist of
one or more levels. Each level represents a different grouping within
the same dimension. For example, a time dimension can include levels
such as years, months, and days. Or an organization dimension of a
bank's customer service centers can include levels such as branches,
states, and regions.
Levels are organized
into one or more hierarchies, typically from a coarse-grained level
(for example, Year) down to the most detailed one (for example, Day).
The individual category values (for example, 2002 or 21Jan2002) are
called members.
A dimension can also
have multiple hierarchies to provide different sequences of groupings.
For example, a "Time" dimension can have a "Fiscal Year" hierarchy
and a "Calendar Year" hierarchy.