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Options

This variant uses the Xbar-R Chart dialog, which is documented in full, control by control, on Xbar-R and Xbar-S Options. Read that page for the Data tab, the sigma estimators, the limit types, the transformation, the splits, the rules and the Capability tab. Every one of those behaves here exactly as it does there.

This page lists only what changes when the Chart: radio group is set to Xbar only.

Want to build one first?

The walkthroughs live with the full chart: How-To builds one step by step from sample data you copy off the page straight into Excel, and How-To with GroupBy does the same with a grouping column. Both use both panels; switch the Chart: radio group to this variant at the same point in the steps to follow along here.

What changes under Xbar only

  • Only the upper panel is drawn. The Range panel is still computed, it is just not written to the worksheet, and it gets no row in the summary table either.
  • Rules 5 through 8 stay available. They test the location panel, and the location panel is the one being drawn. The italic note that says they apply to the Xbar panel only disappears, because there is no other panel to distinguish them from.
  • Reference lines are drawn. They attach to the location panel, which is present here.
  • The manual limits grid still shows the Range row. Anything entered in it is accepted and computed but never becomes visible.

Getting an Xbar chart estimated with Sbar

The ribbon's Xbar entry always opens the Xbar-R dialog, so the sigma estimate offered is Rbar or the pooled standard deviation. If you want the means with an Sbar estimate instead, open Xbar-S from the ribbon and select the Xbar only radio by hand. No ribbon button produces that combination directly.

What does not change

The dialog title stays Xbar-R Chart. All four tabs are present, including Capability. The other panel is still computed, so switching the variant and running again costs nothing but the redraw, and Modify Existing Analysis can move you between the variants without re-selecting your data.

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