The Square Root of N Plus One Sampling Rule

May 2, 2003
Hewa Saranadasa, PhD

Hewa Saranadasa, PhD, is a senior statistician at Pharmaceutical Sourcing Group Americas, a division of Ortho-MacNeil Pharmaceutical, Inc.

Pharmaceutical Technology, Pharmaceutical Technology-05-02-2003, Volume 27, Issue 5

Manufacturers who use the square root of N plus one rule as part of their overall sampling plan may be surprised to learn of its inadequacies and whether it truly represents the entire batch.