TECHNOLOGY OVERVIEW

Zone Charts

The BIS.Net Team BIS.Net Team
Zone Chart Figure 1: Zone Chart

Standard control charts consist of outer control limits and sometimes warning limits. Some analysts will enhance these charts with run and trend tests to increase the sensitivity to detecting variation due to assignable causes. BISNET Analyst, does not support this practice as it increases the false alarm rate with the risk of causing more harm than good. Instead BISNET Analyst provides a Zone chart with a comprehensive set of run and trend tests

Zone Chart selections Figure 2: Zone Chart Selections

Note:

Standard Zone charts can only be applied to symmetrical (about the mean) charts without autocorrelation i.e. the X-Bar and Individuals chart. Excluded are the Moving Average, EWMA, Cusum, Range, Sd and Attributes charts

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