SPC
Xbar-S Chart Calculator
Upload subgrouped CSV data or use example data to calculate Xbar-S chart center lines and control limits.
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Upload CSV or Use Example Subgroup Data
Each row is one subgroup. Use one numeric column per observation within the subgroup.
Interpretation
Xbar-S charts are commonly used when subgroup standard deviations are preferred over ranges, especially for larger subgroup sizes.
UCLx̄ = x̄̄ + A₃S̄