Node for creating generalization hierarchies. There are four different types of hierarchies:
Masking is a flexible mechanism that can be applied to many types of attributes and is especially suitable for alphanumeric codes, such as ZIP codes.
Interval is a regular method of generalization for values with a ratio scale, such as integers or decimals. First, the sequence of intervals can be defined on the left side of the view. At the next step subsequent levels consisting of groups of intervals from the previous level are specified. Each group combines a given number of elements from the previous level. Any sequence of intervals or groups is automatically repeated to cover the complete range of the attribute.
Order-based hierarchies follow a similar idea as interval-based hierarchies, but they can be applied to attributes with ordinal scale. In addition to the types of attributes covered by interval-based hierarchies this includes strings, using their lexicographical order, and ordinals.
Date-based hierarchies are used by specifying the granularity of output data at increasing generalization levels.
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