Reigle Stewart
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Reigle Stewart replied to the topic TTest and FTest Equality in the forum General 17 years, 6 months ago
Stan: To reconfirm the status of your paper, I contacted
ASU today and nobody including Jeff Goss or Dr.
Montgomery have received a white paper from you, nor
have they had any communication with you concerning
your participation in the scheduled debate. Please
remember the deadline for your white paper is by close of
business on July…[Read more] 
Reigle Stewart replied to the topic Reliability at TOYOTA. How far is 6 sigma quality? in the forum General 17 years, 6 months ago
Peppe: You are right on target. As the mean of each CTQ
approaches its target value (nominal specification) and
the variance is reduced, the probability of defect is
reduced. As the probability of defect is reduced for each
CTQ, the rolledyield is increased. As the rolled yield
increases, the the total defects per unit is reduced…[Read more] 
Reigle Stewart replied to the topic Reliability at TOYOTA. How far is 6 sigma quality? in the forum General 17 years, 6 months ago
V. Laxmanan: Your position has lots of emotional appeal
but might be lacking in the operations management
arena. I would agree that external measures are the end
game. After all, it is the customer’s perspective.
Nontheless, we must also have internal measures of
performance, especially those measure that correlate to
the external…[Read more] 
Reigle Stewart replied to the topic TTest and FTest Equality in the forum General 17 years, 6 months ago
Stan: As of today, Mr. Jeff Goss or Dr. Montgomery at
ASU has NOT received any type of white paper or
communication from you. Their email addresses have
been posted several times for your convienence. The
stage is set, the parties are ready, the referees await your
position paper. Respectfully, Reigle Stewart 
Reigle Stewart replied to the topic TTest and FTest Equality in the forum General 17 years, 6 months ago
New BB: What Jamie says is so true, but often
overlooked by many practitioners. Given the statistical
relationship between the ttest, Ftest and ANOVA, one
can easily and confidently conclude that any given
difference between two or means can be mathematically
equated to a ratio of the variances. In short, a mean shift
can be…[Read more] 
Reigle Stewart replied to the topic Reliability at TOYOTA. How far is 6 sigma quality? in the forum General 17 years, 6 months ago
Bev: I would respectfully disagree with your position
concerning the J.D. Powers data. Such disagreement is
based on two points. First, it was Mr. Bill Smith at
Motorola in the early 80’s that discovered an empirical
correlation between the field failure rate of electronic
equipment and the total defects produced during…[Read more] 
Reigle Stewart replied to the topic Reliability at TOYOTA. How far is 6 sigma quality? in the forum General 17 years, 6 months ago
If we assume 200 defects per 100 cars, no matter how
you cut it, that’s 2 defects per car. This is AFTER the
influence of factory inspection and test. Assuming a
combined containment efficiency of 85% (which is
typical), we would see about 13 defects per car BEFORE
test and inspection. Further assuming 2,000 CTQ’s per
car, this g…[Read more] 
Reigle Stewart replied to the topic Calculating the Overall Cpk in the forum General 17 years, 6 months ago
Jude: Convert each Cpk to a standard normal deviate;
i.e., Z=Cpk*3. Next, you must convert Z to equivalent
yield (in Excel use normsdist(Z)). After this, you need to
multiply all of the yield values to get the rolled throughput
yield … Y.rt = Y1 * Y2 * … * Yn, where n is the number of
yield values (i.e., the number of Cpks you…[Read more] 
Reigle Stewart replied to the topic Reliability at TOYOTA. How far is 6 sigma quality? in the forum General 17 years, 6 months ago
From benchmarking we know the average is about 4
sigma. The automobile data is close. Measure with a
micrometer, mark it with chaulk and then cut it with a
handax. Your data reveals a sigma that is below
average. We know Toyota is better than average. So the
defect opportunity count is much too low. I heard from a
Ford executive…[Read more] 
Reigle Stewart replied to the topic Bill Ford, Six Sigma, and Work Function in the forum General 17 years, 6 months ago
Matt: Obviously, the debate has narrowed down to just Stan … the debate format, plans and time allocations have been made accordingly. Remember, the intent of this debate is to establish whether or not the shift factor has theoretical merit and practical application. This brings it down to a digital position. Owing to this, only two…[Read more]

Reigle Stewart replied to the topic Bill Ford, Six Sigma, and Work Function in the forum General 17 years, 6 months ago
Hey Stan: Its good to see that you finally joined us in the
work function thread. I have really missed you … you
know, being on my case and all. My life has not been the
same over the last few days without you. I just wish you
knew what a kick we get from reading your posts. I must
admit that you really work at trying to induce an…[Read more] 
Reigle Stewart replied to the topic Bill Ford, Six Sigma, and Work Function in the forum General 17 years, 6 months ago
V. Laxmanan: Thank you for your kind and timely
responses to my questions. Do understand that I deeply
appreciate your innovative thinking. There is currently
enough information and data for me to chew on for some
time. Now, I need to just sit back and think about it.
Again, your contribution and efforts are greatly
appreciated.…[Read more] 
Reigle Stewart replied to the topic Bill Ford, Six Sigma, and Work Function in the forum General 17 years, 6 months ago
PB: Excellent points! Do recognize that the “model”
parameters of many control charts also change after each
new data point (or grouping of data) — much like the
EWMA chart. Also, the fundamental model of many SPRT
tests change (like Sequential Probability Ratio Tests; i.e.,
sequential hypothesis testing). So, a dynamic and…[Read more] 
Reigle Stewart replied to the topic Bill Ford, Six Sigma, and Work Function in the forum General 17 years, 6 months ago
Darth: I fully agree with your position and support your
assertions. I do believe he is entitled to a little more time
to “boil the ocean,” although I too am getting somewhat
anxious about the proverbial “bottom line.” He did
promply reply to my request for a pragmatic example
(reference his DPMO example), although it too was…[Read more] 
Reigle Stewart replied to the topic Bill Ford, Six Sigma, and Work Function in the forum General 17 years, 6 months ago
To All. Innovation must rise above all else in our field of
endeavor. Rote understanding of existing knowledge is
great, but what marks the pioneer is the ability and desire
to innovate. V. Laxaman is doing a marvealous job at
trying to communicate a possible innovation. Until we
study it and comphrehend the possibilities, we will…[Read more] 
Reigle Stewart replied to the topic Bill Ford, Six Sigma, and Work Function in the forum General 17 years, 6 months ago
Darth: The practical significance of all this is as follows.
Laxaman has identifed a simple equation that MIGHT be
useful to forecast the performance of something that
would normally reported as a simple ratio. As you know,
many six sigma metrics are presented as a simple ratio,
but often fail to communicate what is really going on.…[Read more] 
Reigle Stewart replied to the topic Bill Ford, Six Sigma, and Work Function in the forum General 17 years, 6 months ago
V. Lamanan. Thank you very much for your application
example (i.e.DPMO). The idea that y=defects and x=
opportunities greatly facilitated my understanding of your
value proposition. It seems to me that y=hx+c is
applicable, but does represent a significant overlap with a
statistical procedure called “linear regression.” As you
may k…[Read more] 
Reigle Stewart replied to the topic ITRIZ vs TRIZ in the forum General 17 years, 6 months ago
Rod: According to Dr. Elena Averboukh [an industry
funded professor at the University of Kassel (Germany)],
“TRIZ basic postulates, methods and tools, including
training methodologies invented by H.Altshuller have
been further developed and significantly enhanced by his
followers, researchers and trainers (from 1985 to
present),…[Read more] 
Reigle Stewart replied to the topic Ppk versus Cpk in the forum General 17 years, 6 months ago
Sgollus: To help answer your question, I refer you to the
“Ask Dr. Harry” forum on this site. He states: “One must
necessarily understand that the shortterm standard
deviation reports on the “instantaneous reproducibility” of
a process whereas the longterm standard deviation
reflects the “sustainable reproducibility.” To this end…[Read more] 
Reigle Stewart replied to the topic Moderator Bias in the forum General 17 years, 6 months ago
Mike: You say I do not need to bring up Dr. Harry
everytime I post. Interesting you point this out to me when
a select few spew out their false statements about him
(i.e., Stan) in an obvious attempt to discredit and defame
his work (every chance they get). Why don’t you provide
commentary on this each time they do this and point out…[Read more]  Load More