Individuals Moving Range (ImR - XmR) Chart in Excel
Use an Individual Moving Range chart to evaluate stability of processes using variable data--time, cost, length, weight when your sample size is one.
Example of an Individual Moving Range chart created using QI Macros for Excel.
Individuals Moving Range (XmR) chart data examples
Data is organized as one column of ratios or measurements.
Rule: Evaluate the range chart first. If it is "out of control," that means the process variation is out of control.
The X chart uses the average range (Rbar) to calculate its UCL and LCL. So if the range chart is out of control, the calculations for the X chart limits will be incorrect. If the range chart is in control, then evaluate the X chart.
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