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p‐Charts for Attribute Control

Víctor Leiva

Universidad Adolfo Ibáñez, Viña del Mar, Chile

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Teresa Oliveira

Universidade Aberta and CEAUL, Lisbon, Portugal

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First published: 18 December 2015
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Abstract

In this article, we present charts for attribute control by means of the proportion ( p ) of defective items, named p ‐charts. Such charts are often used in statistical quality control to monitor the behavior of production processes by means of p over time. When the sample size ( n ) is constant, charts for attribute control related to the number ( np ) of defective items, named np ‐charts, are a good alternative to the p ‐charts. A review of the basic issues related to p ‐charts and some recent ideas on the topic are provided considering life distributions. An implementation in the R software is discussed using examples.