Variable Charts

Chart Type

Minimum Subgroup Size

Maximum Subgroup Size

LCL UCL LSL USL
X-bar Chart 2 30 (if the limits are to be based on the ranges)

Infinite (if /stdev option is used)		 Negative Infinite Positive Infinite Negative Infinite Positive Infinite
R-Chart 2 30 0 Positive Infinite 0 Positive Infinite
s Chart 2 Positive Infinite 0 Positive Infinite 0 Positive Infinite
Individual Chart 2 30 Negative Infinite Positive Infinite Negative Infinite Positive Infinite
Median Chart 2 25 Negative Infinite Positive Infinite Negative Infinite Positive Infinite
Moving Average Chart 2 30 Negative Infinite Positive Infinite Negative Infinite Positive Infinite
Moving Range Chart 2 30 0 Positive Infinite 0 Positive Infinite
Cumulative Sum Chart 1 Depends on number of cases of variable. (This chart requires at least two subgroups.) N/A N/A N/A N/A
Process Capability Chart 1 <=30 unless sigma is based on the subgroup Standard Deviations Negative Infinite Positive Infinite Negative Infinite Positive Infinite
Process Capability Analysis N/A N/A N/A N/A < Mean within group variation Depends on 'Tail Fraction of data to use'
Group Measures Chart N/A N/A N/A N/A N/A N/A
 

Attribute Charts

Chart Type Minimum Subgroup Size Maximum Subgroup Size LCL UCL LSL USL
c Chart N/A N/A 0 Infinite 0 Infinite
np Chart Number of units inspected Positive Infinite 0 Positive Infinite 0 Positive Infinite
P Chart Number of units inspected Positive Infinite >=0 <=1 if fraction scale is used on Y-axis.
<=100 if percent scale is used on Y-axis.		 >=0 <=1 if fraction scale is used on Y-axis.
<=100 if percent scale if used on Y-axis.
U Chart N/A N/A >=0 Positive Infinite >=0 Positive Infinite
U type Cumulative Sum Chart >=1 Positive Infinite >=0 Positive Infinite N/A N/A
Pareto Chart N/A N/A N/A N/A N/A N/A