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2. Summarization Patterns > Numerical Summarizations

Numerical Summarizations

Pattern Description

The numerical summarizations pattern is a general pattern for calculating aggregate statistical values over your data is discussed in detail. Be careful of how deceptively simple this pattern is! It is extremely important to use the combiner properly and to understand the calculation you are performing.

Intent

Group records together by a key field and calculate a numerical aggregate per group to get a top-level view of the larger data set.

Consider ? to be a generic numerical summarization function we wish to execute over some list of values (v1, v2, v3, …, vn) to find a value ?, i.e. ? = ?(v1, v2, v3, …, vn). Examples of ? include a minimum, maximum, average, median, and standard deviation.


  

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