
Jennifer Atlas replied to the topic Minitab: Fitted Mean Calculation? in the forum Tools & Templates 23 minutes ago

Chris Seider replied to the topic Minitab: Fitted Mean Calculation? in the forum Tools & Templates 3 hours, 57 minutes ago
When doing the Oneway ANOVA, the means are the means of the groups associated with the factors.
@joelatminitab who’s your replacement again? can’t remember!

Robert Butler replied to the topic Question About Power in the forum New to Lean Six Sigma 1 day ago
If you look at the equations for alpha and beta they are of the form
alpha equation: (Ybarc – Xbar1)/(sigma/sqrt(n)) = 1.645 ( for alpha = .05)
beta equation: (Ybarc – Xbar2)/(sigma/sqrt(n)) = ?Where Ybarc is the point between the two means (Xbar1 and Xbar2) that will be the cut point for accepting or rejecting the null hypothesis.
If you…[Read more]

Chris Seider commented on the post, Course Correction? Tips for Doing a Deployment Review 1 day ago
I like the simple concept of the 3 “pillars” of execution, strategy, and infrastructure.

Chris Seider replied to the topic NDC 1 and R and R % Is Less Than 10% in the forum Tools & Templates 1 day, 3 hours ago
consider looking at the range among the 3 operator xbar results for each chart–you should see it’s not looking good as a gauge.

Chris Seider replied to the topic Attribute Agreement Analysis in the forum Methodology 1 day, 5 hours ago
no attachment seen

Katie Barry replied to the topic Seven Wastes Problem in the forum New to Lean Six Sigma 1 day, 23 hours ago
Arslan — How do you think the problem should be solved? What have you tried? Where are you running into a problem? You’re far more likely to receive helpful responses if you show that you’ve put forth a goodfaith effort to solve your problem before asking for assistance. The iSixSigma audience can be exceptionally helpful, but they are not here…[Read more]

Robert Butler replied to the topic Hypothesis Test for Y(%) – Analyze in the forum Tools & Templates 4 days, 5 hours ago
You are right – seeing the data does make a difference. Given what you have the approach I outlined in my last post won’t work. If we take your data set and check the X’s for independence they have enough to permit the inclusion of all of them in a multivariable model. If you run backward elimination on a model of the form…[Read more]

Robert Butler replied to the topic Hypothesis Test for Y(%) – Analyze in the forum Tools & Templates 4 days, 16 hours ago
Since you only assign one X to a given failure the best bet would be to run a logistic regression with the response being pass/fail and the X’s coded as 0/1 (No/Yes) for occurrence. The coefficients of the output of a logistic regression are odds ratios and they express the odds of occurrence of a success for the occurrence of a given X.
If…[Read more]

Chris Seider replied to the topic Gage R&R for 2 Gages in the forum Tools & Templates 5 days, 4 hours ago
it’s a busy morning, are you sure you set up the machines as each operator and had each machine test each item 3X

Robert Butler replied to the topic Hypothesis Test for Y(%) – Analyze in the forum Tools & Templates 5 days, 20 hours ago
Question: How many deliveries do you have in 26 days?
Question: How do you know that a 26 day sample is at all representative?
Question: Does the existence of any one of the X’s result in a failure or do you have some kind of overlapping where a failure might have one or more of the X’s?Based on what you have written I would not recommend…[Read more]

Chris Seider replied to the topic Gage R&R for 2 Gages in the forum Tools & Templates 6 days, 21 hours ago
post the results of the gage R&R it might help.

Chris Seider replied to the topic Looking for Tips for a New Deployment in the forum Implementation 1 week ago
Do you have a champion for doing this? I would suggest having a metric to track for your processes you’re wanting to standardize. Standardization won’t always be best if best practices aren’t implemented.
Just a few thoughts.

Robert Butler replied to the topic Calculation of Cp and Cpk with Attribute Data in the forum Suggestion Box 1 week, 1 day ago
Chapter 9 of Bothes’s book Measuring Process Capability covers all of the different ways one can calculate Cpk from attribute data. It’s too long to try to quote on a forum of this type but you should be able to get the book through interlibrary loan. If you type in “calculating Cpk using attribute data” on Google you will get 100,000 or so…[Read more]

Robert Butler replied to the topic Calculation of Cp and Cpk in the forum Suggestion Box 1 week, 1 day ago
Chapter 9 of Bothes’s book Measuring Process Capability covers all of the different ways one can calculate Cpk from attribute data. It’s too long to try to quote on a forum of this type but you should be able to get the book through interlibrary loan. If you type in “calculating Cpk using attribute data” on Google you will get 100,000 or so…[Read more]

Robert Butler replied to the topic Addition and Substraction of Distributions in the forum Tools & Templates 1 week, 3 days ago
@cseider Contrary to how some of my posts about the ttest sound I too am not adverse to using other tests to check for population differences. The fact is that the WilcoxonMannWhitney test can be used anywhere the ttest is used and it can handle crazy nonnormal data and find a significant difference where a ttest with the same data would…[Read more]

Chris Seider replied to the topic Addition and Substraction of Distributions in the forum Tools & Templates 1 week, 5 days ago
@rbutler Nicely done. ;)
We do know that traditionally ttests are considered for normal distributions. I know I’ve read your comments and other research saying they are robust enough with nonnormal data but IF one has to “pick” the test to get the probability wanted–it might not be a root cause being tested ;) I don’t mind advising folks…[Read more]

Robert Butler replied to the topic Addition and Substraction of Distributions in the forum Tools & Templates 1 week, 5 days ago
@cseider it probably comes from the same people who have provided us with other nifty altfacts of statistics such as:
1. You should try to have sample sizes of 30 because the central limit theorem states that samples of this size will be normally distributed.
2. In order to use the ttest the data must be normal.
2a. In order to use the ttest…[Read more] 
Chris Seider replied to the topic Addition and Substraction of Distributions in the forum Tools & Templates 1 week, 5 days ago
I’ve seen others make that statement about regressions needing normal data….where/when did that horrible impression creep into people’s minds?
I have a theory…

Robert Butler replied to the topic AlHikmah University Postgraduate Admission Form 2017/2018 Is Out in the forum General 1 week, 5 days ago
Would you please be more specific? How far is “out”? – 1,2,or 3 standard deviations? Greater than 1.5 IQR? or is it some other measure?
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