Presentation of some control cards : Control charts by attribute

Control charts by attribute
Presentation of some control cards

Author : Morgan GERMA

Publication date: March 10, 2015 | Lire en français

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2. Control charts by attribute

Attribute-based control consists in controlling the quality of a qualitative variable by enumeration. This type of chart is generally used to monitor a quantity or proportion of defects or non-conformities.

2.1 P card

The P-card, where "p" is the proportion of defective parts contained in a sample, enables the proportion of defective parts to be tracked chronologically. A quantity n of parts is taken at regular intervals (noted k ) and the proportion of defective parts is counted. Over a long period, the average proportion Pm is deduced, along with the monitoring limits LS and control limits LC .

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Control charts by attribute