The following commands are available in the Sample section:
Sampling
Much ActiveData's sampling is derived from an Institute Of Internal Auditors (IIA) Research Foundation Handbook written by Dr Barbara Apostolou (Ph.D., CPA) called Sampling: A Guide for Internal Auditors ISBN : 0-89413-542-2.
Section III covers attribute sampling and section IV covers PPS sampling.
ActiveData uses the tables contained in the appendices to calculate various results.
This publication is available from the TheIIA.org and Amazon.com:
The following Wikipedia page contains many useful discussions about statistical sampling:

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