X-Bar Chart Calculations - Quality America Inc.

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5. X Bar Chart Calculations

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Tools

Concepts

SPC defined

Control Chart Properties

Rational Subgroups

Distributions

Defining Control Limits

Short Run Techniques

Interpretation & Calculations

Attributes Charts

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X-Bar / Range Charts

X-Bar / Sigma Charts

Individual-X Charts

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Histograms, Process Capability

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SPC to Improve Quality, Reduce Cost

Struggling with Independence

SPC Analysis of MLB Home Runs

Use Of SPC To Detect Process Manipulation

Using Data Mining and Knowledge Discovery With SPC

Index

Plotted statistic

Subgroup Average

Center Line

Grand Average

UCL , LCL (Upper and Lower Control Limit)

where x-double bar is the Grand Average and σx is Process Sigma, which is calculated using the Subgroup Range or Subgroup Sigma statistic.

Notes: Some authors prefer to write this x-bar chart formula as:

where R-bar is the Average Range , or

where S-bar is the Average Sigma .

Learn more about the SPC principles and tools for process improvement in Statistical Process Control Demystified (2011, McGraw-Hill) by Paul Keller, in his online SPC Concepts short course (only $39), or his online SPC certification course ($350) or online Green Belt certification course ($499).

Quality America offers Statistical Process Control software, as well as training materials for Lean Six Sigma, Quality Management and SPC. We embrace a customer-driven approach, and lead in many software innovations, continually seeking ways to provide our customers with the best and most affordable solutions. Leaders in their field, Quality America has provided software and training products and services to tens of thousands of companies in over 25 countries.

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