Tools

Concepts

Control Chart Properties

Rational Subgroups

Defining Control Limits

Short Run Techniques

Interpretation & Calculations

Attributes Charts

X-Bar / Range Charts

X-Bar / Sigma Charts

Individual-X Charts

Moving Average Charts

Multivariate Control Charts

Histograms, Process Capability

Autocorrelation Charts

Measurement Systems Analysis

Applications

Getting Started with SPC

Key Success Factors for the Implementation of SPC

How to Study Process Capability

Multiple Steam Processes

Analysis of Batch Processes

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

X-Bar Sigma Charts

SPC Software displays X-bar / Sigma chart with process capability estimates from SPC IV Excel software

An X-bar & Sigma Chart with process capability estimates from SPC IV Excel software.

X-bar & Sigma Charts are a set of control charts for variables data (data that is both quantitative and continuous in measurement, such as a measured dimension or time). The X-bar chart monitors the process location over time, based on the average of a series of observations, called a subgroup. The Sigma chart monitors the variation between observations in the subgroup over time.

See also:

When to Use an X-bar / S Chart

Interpreting an X-bar / Sigma Chart

X Bar Chart Calculations

Sigma Chart Calculations

Use of Specification Limits on an X-bar Chart

Fixed or Varying Subgroup Sizes for X-Bar charts

Create Xbar charts in Excel

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).