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List of the eight Nelson Rules for interpreting control charts One point above UCL or below LCL. Two points above/below 2 sigma. ... Four out of five points above/below 1 sigma. Eight points in a row above/below the center line. Six points in a row ascending or descending (trend)

All control charts have three basic components: a centerline, usually the mathematical average of all the samples plotted. upper and lower statistical control limits that define the constraints of common cause variations. performance data plotted over time.

There are five commonly used control charts for continuous variables: range (R), standard deviation (S), moving range (MR), mean (X-bar), and individuals (I) charts. The X-bar chart is generally paired with either R or S chart, and the I chart is often paired with the MR chart.

Basic Procedure Choose the appropriate control chart for your data. Determine the appropriate time period for collecting and plotting data. Collect data, construct your chart and analyze the data. Look for "out-of-control signals" on the control chart. ... Continue to plot data as they are generated.

Also called: Shewhart chart, statistical process control chart. The control chart is a graph used to study how a process changes over time. Data are plotted in time order. A control chart always has a central line for the average, an upper line for the upper control limit, and a lower line for the lower control limit.

ProDiver control charts fall into one of two categories: variable or attribute. Variable control charts plot measurable process data in a time-ordered sequence. Attribute control charts plot data that is counted instead of being measured.

Types of Control Charts X-Chart. X-Charts present variable data. ... P-Chart. P-Charts are used for data that is counted. ... NP-Chart. NP-Charts are used to present the number of nonconforming or conforming items. ... C-Chart. ... U-Chart. ... MR-Chart. ... Individual MR-Chart. ... Custom Data Control Chart.

Explanation of the rule of seven (heuristic) on a Control Chart with the help of an example and exercise. The rule of seven states that if seven or more consecutive measurements fall on one side of the mean that there's an assignable cause that needs investigation.

A control chart is a type of line graph used to assess and maintain the stability of a process. A center line and upper and lower control limits (collectively called control lines) are drawn on a graph.

There are three types of control charts: (1) C-chart that measures the number of nonconformities (such as defects or errors) over time, (2) R-chart which shows the range of each sample set or subgroup over time, and (3) S-chart which shows the standard deviation of each sample set or subgroup over time.