Yes. There is still a margin of error.
Depending on how you run the survey there are errors in:
1. Formulating the questions so participants understand what they are being asked.
2. Interpreting the answers (if comments are asked for).
3. Participants chosing the wrong box on a form or pushing the wrong button on a screen.
I am sure the…[Read more]
You can run a regression model including the interaction terms and save the residuals for the interaction terms.
Then run the regression using the residuals of the interactions as the values for the interactions. This removes the multicollinearity from the model.
If your interactions are important, the regression with the residuals…[Read more]
Well let’s review.
Six Sigma has no new tools. Inference, all the tools are old.
Quality professionals have been using these old tools for decades.
I think I am having a little trouble understanding why you all seem to dislike six sigma so much given that you have used the same tools, and come up with the same answers, for decades.
Are th…[Read more]
The survey draws sweeping conclusions based on numbers that are not statistically different. The accuracy of this survey is probably on the order of + or – 10% at best. None of the so called differences are statistically different even at a +- 3% level.
If you are looking for a permanent job with openings for Black Belts dealing with the military, try Raytheon, Lockheed Martin, Honeywell, General Electric, SAIC, and Westinghouse.
If you want to be a private consultant there are several places to look that we can discuss.
Just a little more information before we talk.
Okay. There must be something I do not understand about the physics of the shaft.
There is definitely something I do not understand about the information gained by the test as it is described.
So be it. The issue isn’t why the test is done that way, but how to statistically handle the results.
Have a good day.
I agree with the methods recommended by BTDT and Stan.
One other thing you may want to consider is there are errors on your forms that customer satisfaction (number, arrival date, etc) and there are administrative errors that do not affect customer satisfaction.
You may consider evaluating your opportunities into those affecting…[Read more]
Phil and Chad,
If what I am hearing you say is true:
The shaft is twisted 270 degrees and measured to confirm that a minimum amount of torque has been transmitted.
As little as 1 degree of flex constitutes a destructive test.
I am wondering how this shaft operates in the intended function and how much torque is required to be…[Read more]
No matter how the shaft is constructed, if the purpose of the shaft is to transmit torque, then if I twist the shaft to the maximum torque specification and there is no plastic deformation of the shaft, I have proven that the shaft performs the function intended.
Unless I do not understand this measuring device, the device is g…[Read more]
According to Breyfogle, Implementing Six Sigma, in a destructive test it is impossible to separate Gage Variation from Part to Part Varation.
Accordingly, I do not believe you can accomplish your goal using destructive testing.
If I were you I would develop a non-destructive test for this part. For example:
Place a series of strain…[Read more]
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