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I have a column of 300 numbers that I would like to do a histogram, johnson bounded curve fit, but the chart that’s generated is a normal curve and the program states “the selected region could not be fit into a johnson curve fit” What do I have to do to make it fit? I reduced the number of rows to 100 and it worked, but I need all the data if possible.
Thanks,
Wendell W.
Manufacturing Engineer
pak on 04.16.08 @ 03:37 PM MST [link]
I would like to know how to analyze surface finish in your SPC IV Excel software. I am attaching a sample of data. The Upper Specification Limit for the finish is 63.
Cheryl D.
pak on 03.13.08 @ 12:57 PM MST [link]
I've always heard about Six Sigma and how important it is for a large business.
As a Human Resources Manager, what benefits can I expect in learning the Greenbelt Certification?
I deal with Staffing and Employee Relations and I guess I cannot see the "bigger picture" from this vantage point in pursuing this.
I would appreciate your embellishing some on this philosophy.
Renee A.
pak on 02.08.08 @ 04:03 PM MST [link]
After studying Lean Method, I found that CMMI is somewhat conflicting with it.
There is a lot of processes that CMMI requires and don't contribute to any value
to customers, especially documentation. That is also the area that a lot of SW
engineers complaint about. To work on documentation, it really increase the cycle
time or the project completion time. But from CMMI's point of view, it is very necessary
because if there is no documentation, it would become nightmare for maintenance.
May be this is not a direct value to customers. Instead, it is indirect value. Or
can I say it is type 1 Muda?
Ed C.
pak on 01.11.08 @ 03:52 PM MST [link]
I am still puzzled by the 1.5 sigma shift.
Are you saying that the field survey, field data, field statistics are all different from internal survey,
internal data and internal statistics? And that difference is about 1.5 sigma shift. Are there
reasons for this shift? Is this the reason that process improvement has to base on customer's
input, i.e. the receiver of the output of a process so the 1.5 sigma shift can be covered?
Ed C.
pak on 12.20.07 @ 03:47 PM MST [link]
We are working to implement Six Sigma, and would like to use your diagram to better explain it to upper management. We just want to fully understand what the sigma levels represent. I have attached a copy of the diagram.
My specific questions are 1) is this actual data or illustrative? 2) what does the bogey golf number represent? 3) what about the airline fatality (is that plane crashes, individual fatalities, etc.)
pak on 11.09.07 @ 11:14 AM MST [link]
The regular quality control chart usually uses 3 sigma for upper and lower limits.
The chances that the defect falls outside the limits are 0.26%, i.e. 99.74% of the
output falls inside the limits. But if we look at the theory of six sigma, the defect
rate at 3 sigma is 6.68% assuming normal distribution with upper and lower limits.
Why such a big discrepancy?
Ed C.
pak on 10.27.07 @ 01:56 PM MST [link]
We are working to implement Six Sigma, and would like to use your diagram to better explain it to upper management. We just want to fully understand what the sigma levels represent. I have attached a copy of the diagram.
My specific questions are 1) is this actual data or illustrative? 2) what does the bogey golf number represent? 3) what about the airline fatality (is that plane crashes, individual fatalities, etc.)
Judy C.
Consultant, Business Optimization
pak on 10.13.07 @ 11:12 AM MST [link]
We have series of individual voltage measurements taken on our sensors during testing. The sensors can be grouped into batches with varying batch size. How best can we monitor batch to batch variations across batches with varying batch size? All SPC software we find are restricted by fixed sub-group sizes which prohibit the calculation of our batch means.
Richard T., Product Assurance Engineer
pak on 09.07.07 @ 04:11 PM MST [link]
Simply email us using the Ask a Question link found in the right-hand sidebar of the blog pages. We usually select a couple general interest questions each month to post here, and respond individually to each separately. We look forward to hearing from you!
The answers to each of the posted questions are accessed via the colored link following each question.
pak on 05.01.07 @ 01:56 PM MST [link]
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