XBar-R chart calculations

XBar-R chart control limits are calculated as follows:

XBar-R chart calculations


Control Limits calculated from

Control Limits calculated from
standard (mean ( ยต ) and/or
standard deviation (s ) are

XBar chart control limits


Range chart control limits


NOTE: If subgroup size is variable, m is replaced with mi for ith subgroup limits. When subgroup size is variable, the control limit values will not be the same; therefore, the chart may display `city skyline' type control lines (when subgroup size is from 2 - 25).

Data Plot Items

Descriptive Statistics

See Also

Quality Chart Formula Reference

XBar-R chart

XBar-R chart properties

Configuring an XBar-R chart

XBar chart

Range chart

XBar-S chart