In other words, the moving range chart tracks the absolute difference between each measurement to its previous measurement. MR Chart: While the Individual chart monitors the process mean, the Moving Range chart monitors the process variation when the data points are collected at regular intervals of time. This chart will help to identify the common and assignable causes in the process, if any. I-Chart: Individual chart displays the individual data points and monitors the mean and shifts in the process when the data points are collected at regular intervals of time. I-MR DefinitionĪn I-MR chart is basically two separate charts–the Individuals (I) chart and the Moving Range (MR) chart, the combination of two charts provides the complete picture of process behavior. A graphical I-MR chart helps identify when the process goes out of control and indicates where to focus on the source of the assignable cause. An I-MR chart provides process variation over time in a graphical method. In other words, collect a single observation at a time. I-MR chart, also called an X-MR chart, is a combination of two charts (Individual and Moving Range) to track the process variability based on the samples taken from a process over a period of time.Īn Individual moving range (I-MR ) chart is used when continuous data is not collected in subgroups. I-MR chart was introduced by Walter Shewart hence control charts are also called Shewart Charts.
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