Control Chart Properties
Defining Control Limits
Short Run Techniques
Interpretation & Calculations
X-Bar / Range Charts
X-Bar / Sigma Charts
Moving Average Charts
Multivariate Control Charts
Histograms, Process Capability
Measurement Systems Analysis
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
A Process Capability Index. A measure of both process dispersion and its centering about the average.
where x-doublebar is the Grand Average and σx is Process Sigma, which is calculated using the Moving Range (when subgroup size = 1) or Subgroup Sigma (subgroup size >1) statistic.
Znormal,p and Znormal,1-p are the z-values of the normal cumulative distribution curve at the p percentage point and the 1-p percentage points, respectively.
Confidence Intervals for Cpk
Capability index Calculation in Minitab
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).