Robert Butler replied to the topic How to Analyze Non-normal Data and Indicate the Capability of the Process? in the forum General 2 days, 8 hours ago
I’m not trying to be funny at your expense but if you really have a process like this then then next Nobel Prize in Physics will be yours on demand because you have found a process that exhibits zero variation which means you have invalidated the second law of thermodynamics – something that heretofore was deemed physically…[Read more]
I would recommend you re-examine your data. The IMR plot gives a visual impression of three distinct shifts downward in your data. The first cut point occurs at about data point 44, and the second at about data point 83. It also gives the impression the process is drifting back toward the target around data point 93. In short, the plot would…[Read more]
I’m not trying to be sarcastic but who is making the claim that linear plots are mostly used in [an examination?] of a linear regression?
There are any number of reasons why an analysis might result in employing simple linear plots. For example:
1. Your plan for analysis involves running a two level factorial design. – In this case, by…[Read more]
I see I spoke too soon. What I said above still applies with respect to the graphical presentation and sampling plan you should use when repeating your test but since you provided the actual data there are a couple of other things to consider.
Again, if we pretend the sequential measures within a given operator are independent (they’re not)…[Read more]
I don’t know Minitab but I do know they have boxplots graphics which I would recommend you use. You would have side-by-side boxplots of the two shifts. What you will want to do is to make boxplots which also shows the raw data that way you will not only have the boxplot with its summary statistics but you will be able to see visually just how…[Read more]
Just a visual impression of your data says you have a statistically significant difference in mean scoop size between first and second shift. If we check it formally and pretend the measures within each team member can be treated as independent measures then what you have is 1.22 vs 1.88 (which, given the limit on significant digits reduces to…[Read more]
Robert Butler replied to the topic What Was Your Career Path Into Process Improvement? in the forum General 2 weeks, 1 day ago
Wellll…not counting the mandatory military service I don’t think there’s been any time in my career when I wasn’t involved in process improvement. I started off as a physicist working in advanced optics – the work was a combination of R&D and improving existing systems/processes. One of the groups I worked with had an assigned statistician. I…[Read more]
I don’t know the basis for your statement “I know that in order to be able to do the Hypothesis Testing we must also be able to test for Normality and the “t-test”. but it is completely false. There is no prerequisite connection between the desire to test a random hypothesis and ANY specific statistical test. Rather, it is a case of for…[Read more]
If we couple what you said in your last post with an assessment of the graphs you have generated I think you might have the answer to your question.
As I said previously, the normal probability plots of cycle time days by department is a very important graph. What it shows is that the cycle time data for 4 out of the 5 departments is…[Read more]
There’s no need to apologize. You have an interesting problem and I just hope that I will be able to offer some assistance. To that end, I may be the one that needs to apologize. I was re-reading all of your attachments and, in light of what you have in the most recent attachment, I’m concerned that my understanding of your process is…[Read more]
Robert Butler replied to the topic What Is the Origin of Measurement System Analysis (MSA)? in the forum Tools & Templates 1 month ago
As @Straydog has noted references to standards in measurements has a very long history. The link below suggests referring to such checks as MSA occurred sometime in the 1970’s
A few general comments/clarifications before we proceed
1. You said “I guess I was looking at the p-value because I know that would determine the kind of test I run eventually.” I assume this statement is based on something you read – whoever offered it is wrong – p-values have nothing to do with test choices.
2. When I made the comment about t…[Read more]
The histograms and the boxplots suggest some interesting possibilities. Based on what you have posted I’m assuming your computer package will not let you have a boxplot which includes the raw data. On the other hand, if there is a sub-command to allow this you really need to have a plot that shows both.
If my understanding of your process is…[Read more]
If your post is an accurate description of your approach to the problem then what you are doing is wrong and you need to stop and take the time to actually analyze your data in a proper statistical manner.
The first rule in data analysis is plot your data. If you don’t know what your data looks like then you have no idea what any of the tests…[Read more]
Please understand I’m not trying to be snarky, condescending, or mean spirited but your post gives the impression that all you have done is dump some data in a machine, hit run, and dumped out a couple of statistics that suggest your data might not exactly fit a normal curve. To your credit it would appear you do know that one of the requirements…[Read more]
I had to look up the definition of IIOT – and the manager in charge of obfuscation proliferation strikes again … :-). If all you have is paper entries then someone somewhere is going to have to sit down and transcribe the data into some kind of electronic spreadsheet.
I suppose their might be some kind of document scanner that could do…[Read more]
This looks like a homework problem so rather than just give you the answers – let’s think about how you would go about addressing your questions.
Question 1: How do you determine the average effect of A?
Question 2: How do you determine the average effect of B?
Question 3: If you have the average effect of A – what is another term for that…[Read more]
Robert Butler replied to the topic Analyzing Continuous Data with a Maximum Possible Value in the forum Tools & Templates 1 month, 4 weeks ago
If that’s the case then the issue should be framed and analyzed in terms of what you mean by on-time delivery.
1. What do you mean by on-time delivery? – need an operational definition here
2. What does your customer consider to be on-time delivery? – need an operational definition here too.
3. What do you need to take into account to adjust the…[Read more]
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