7.00.02 - RandomSample - Aster Analytics

Teradata Aster® Analytics Foundation User GuideUpdate 2

Product
Aster Analytics
Release Number
7.00.02
Release Date
September 2017
Content Type
Programming Reference
User Guide
Publication ID
B700-1022-700K
Language
English (United States)

The RandomSample function takes a data set and uses a specified sampling method to output one or more random samples. Each sample has exactly the number of rows specified.

The RandomSample function is useful for generating test sets, training sets, and initial centers for clustering algorithms.

In addition to the default basic sampling, in which each input table row has a probability of being selected that is proportional to its weight, this function provides two alternate methods, KMeans++ and KMeans||, which are designed for generating a set of initial seeds for the function KMeans.

This function does not work in an SSL-enabled cluster.