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
The exponentially weighted moving average of the current subgroup, as used in a standard EWMA Chart.
λ is the value of the Weighting Factor (user defined; See When to Use EWMA Charts )
x-bart is the subgroup average, for the current subgroup at time t (or the current observation, if subgroup size is one (n=1)).
the value of z at time zero (zo) is either a Target value or the overall Average of the selected subgroups (user defined).
EWMA Control Limits
Interpreting an EWMA Chart
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).