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Construction of a Control Chart
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The construction of a Control Chart follows some
simple general rules. The first thing to plot is the Center
Line. Usually, this is a mean or average of the data being
charted, but not always. Next, we need an estimate of
Sigma calculated for each subgroup. The Control Limits
are then plotted at 3-sigma above and below the Center
Line for each subgroup.
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| Utilizing Statit e-QC for Oracle
Quality Reporting |
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For years, Statit Software has worked
with Oracle Quality to provide customers with a more robust
SPC and analytical reporting solution. Enterprise quality
requires a software solution that gives individuals throughout
the enterprise real-time access to quality reports that
meet their specific information needs. Statit's web-based
quality reporting solution, Statit e-QC, provides analysis
and reporting capabilities to every level of the enterprise,
giving organizations such as GE Medical, Micro Motion, Sandia
National Labs, Rosemount, Special Metals, Wyman-Gordon and
many others dynamic, real-time access to their quality data.
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| DMAIC - Identifying Rejects is Just
the Beginning |
Whether a company is defining
six-sigma projects or implementing other process control
initiatives, enumerating defects is only the beginning.
The real challenge is to identify the source of the defects.
Some defects may be reduced by training or inspection,
but many defects are more difficult to identify and resolve.
Process improvement is an iterative process.
One of the common themes being used to describe this
cycle is DMAIC - Define, Measure, Analyze, Improve and
Control. It is crucial to base decisions on facts and
data. Statit offers a variety of tools to maximize the
effectiveness of each phase in the cycle.
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| Quality Q&A: Evaluating Process
Changes |
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Q: We recently made
some process changes. How can we determine whether these
changes had a significant impact on our process quality?
A: There are several different
tools for visualizing and testing the efficacy of process
changes. Control charts with phases are useful, and box
plots and t-test comparisons can be used to determine the
significance of the process change. To use these tools,
it is necessary to assign a variable to indicate which observations
are from the original process and which observations
are from the changed process.
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| Let Statit Software Work for You!
|
Statit Software's Professional Services
Group is here to help you with all of your training and
custom programming needs. For more information about the
services we offer, click here.
Upcoming Training
Join us in Corvallis, OR, for a class
on Statit Scripting Fundamentals. Class Description
Date: August 19-20 (Tuesday/Wednesday)
Location: Statit Software, Corvallis,
OR
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| Something You'd Like to See? |
Is there a topic you'd like us to discuss?
Have a process improvement question? If so, submit a topic request and
we'll see that your topic gets covered in an upcoming
edition of the Statit Bulletin.
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| Upcoming Webinar: Tampering --
A Short Discussion |
In this month's complimentary
webinar, Guy March will discuss tampering and its effects.
Tampering was responsible for the birth of SPC. We will
review that birth, as well as Deming's view of tampering.
Treating Common Cause variation as Special Cause variation
is one of the quickest ways to throw a system in to chaos. Understanding
"What is tampering?" and "What is systemic
change?" is important to the quality journey.
There are many ways to examine the effects of tampering;
we will show you how we do it using Statit e-QC.
Wednesday, July 9
11am Pacific
12pm Mountain
1pm Central
2pm Eastern
Once you've registered, view a 10-minute overview of Statit e-QC, Statit
Software's continuous quality improvement application
that changes the way your enterprise will approach the
issues of ensuring quality products and services.
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