Sample (Aster Database) - Teradata Warehouse Miner

Teradata Warehouse Miner User Guide - Volume 2ADS Generation

Product
Teradata Warehouse Miner
Release Number
5.4.5
Published
February 2018
Language
English (United States)
Last Update
2018-05-03
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B035-2301
Product Category
Software
When connected to an Aster database, the Sample analysis offers two sampling schemes:
  • A simple binomial sampling on a row-by-row basis with given sample rates
  • Sampling without replacement that selects a given number of rows

The sampling can either be applied without conditions to the entire relation (unconditional sampling), or applied with conditions (conditional sampling).

Only one random number generator is used throughout a single task for unconditional sampling, whereas a separate random number generator is created for each condition in one task for conditional sampling.