Control chart position
Record a subgroup
One row per sample taken at one moment — not one row per partFilters
Applied to every screen, the report and the CSVSubgroup register
No subgroups recorded yet. Add one on the left, import a spreadsheet from the toolbar, or load the sample study from the Settings tab.
Headline figures
X̄ chart — subgroup means, in subgroup order
The dashed line is X̿, the centre line: the mean of the subgroup meansR chart — subgroup ranges, in subgroup order
The dashed line is R̄, the average range: read this chart before the one aboveDistribution of the individual measurements
Every reading, not the subgroup means — eight bins across the observed spanSignals, subgroup by subgroup
Every point that broke one of the two rules this tool appliesSubgroup data
Every subgroup in chart order, with its mean, range and any signalControl limits and capability context
Every figure the charts are drawn from, with the constant usedSettings
Currency, dates and the rules this tool appliesReport header
Appears on the printed reportYour data
Stays on this computerRecords and settings are stored in this browser only. Use Export .json for a backup you can archive or move to another machine, and Import .json to restore it. Reset asks twice, then erases everything.