Tools

Read the whole story in our process excellence books

Learn More with our Online Courses

Use Software for your Six Sigma & SPC charts

Get Certified by author Six Sigma Handbook

Concepts

SPC defined

Control Chart Properties

Rational Subgroups

Distributions

Defining Control Limits

Short Run Techniques

Interpretation & Calculations

Attributes Charts

Pareto Charts

X-Bar / Range Charts

X-Bar / Sigma Charts

Individual-X Charts

Moving Average Charts

CuSum Charts

EWMA 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

Index

Capability index Calculation in Minitab

01/26/2010:

I am having trouble replicating the capability index calculated by Minitab by hand or with other software. Any ideas?


Karla W., Quality Specialist.

When you do your six-pack analysis in Minitab, you need to click the Estimates button, and select the R-bar option for estimating standard deviation. The pooled standard deviation option results in an index known industry-wide as process performance. The r-bar and s-bar methods cited are the techniques developed by Shewhart for use in SPC, and specifically differentiates SPC from classical statistical methods designed for fixed populations.


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).