SPC X-bar & R Control Chart Generator

Generate X-bar and R control charts from subgroup data for manufacturing quality control, with control limits computed from the standard A2/D3/D4 constants.

Subgroup Data (one subgroup per line, comma-separated measurements)

Each line must have the same number of measurements (n=2-10). Example: 74.03,74.00,74.01,73.98,74.02