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Because, the contrast (or contrasts) that make the AxB interaction significant may not be the set of contrasts tested by just focusing on comparisons with a control.
As for your recommendation – if your design matrix is such that the 0 setting for either A or B really means a complete absence of either A or B and not a case of A or B being at…[Read more]

No, the two methods do not show different results – the issue is you are not making the proper comparisons.
In the regression you found the AxB interaction to be significant.
In the test for group differences you chose to run a comparison against the control – this isn’t what you want to do.
There are 4 combinations that comprise the AxB…[Read more]

I was looking at your data set again this evening and it occurred to me if you look at the data for count and count2 there is major difference between the two columns. If count and count2 represent the results of a design and a full replication (I doubt this since the total counts are the same for both count and count2 but bear with me) of the 2…[Read more]

To your first modification of the 2**2 factorial design. What you said you were doing and what you did are two entirely different things. If you are going to set C = (0,0) and D = (1,1) where the combinations are for A and B for those particular experiments then the actual design is:
What you have done is this:
This is just a standard ma…[Read more]

@flamepoop1120 This looks like a homework problem. Although the iSixSigma audience can be extremely helpful, they are not here to do your work for you.
What do YOU think? Are you having trouble getting started? Where are you getting tripped up?
The more specific you are — and the more of your own thinking you provide — the more likely you are…[Read more]

@miparent Have you seen this article? PepsiCo turns to Minecraft, moving virtual training away from ‘Zoom fatigue’  HR Dive — https://www.hrdive.com/news/pepsicoturnstominecraftmovingvirtualtrainingawayfromzoomfatigue/593937/ 1 year, 3 months ago

This looks like a homework problem. Although the iSixSigma audience can be extremely helpful, they are not here to do your work for you.
What do YOU think? Are you having trouble getting started? Where are you getting tripped up?
The more specific you are — and the more of your own thinking you provide — the more likely you are to…[Read more]

Thanks @chebetz
Interesting article. It’s kind of “wonky” but they seem to be making a mountain out of a mole hill if I have the expression correctly. Basically, just because one picks the “correct” side of the stat test with the appropriate pvalue, there is uncertainty which is why things should always be proven “in the field” or else one w…[Read more]

@[email protected] – One of my pet gripes is the fact that when the folks were developing their terminology for six sigma the took the word “sigma” and applied it to the calculation indicated in my first post. That formula is the formula for the sigma level which has nothing to do with the sigma of standard deviation fame. Unfortunately, a n…[Read more]

Sure you could.
Just look at your data–if it’s reported/recorded to the nearest 5 or 10 or 100…then you won’t have the precision potentially to use as continuous.
Don’t forget to do an MSA! 1 year, 5 months ago

Check this website. or google…but lots of advice out there.
Basically, find a project with measurable results, a manageable size, identify team members with a project champion and find an impactful goal and start there.
https://www.villanovau.com/resources/sixsigma/identifyprojects/ 1 year, 5 months ago

Look at the total ppm defective. Translate between Cpk and sigma level…for that one side of the curve. 1 year, 5 months ago

@davidgford iSixSigma has a weekly Insights newsletter that goes out on Mondays. It includes our featured article of the week, highlights recent discussions, and also includes news, jobs and upcoming events. You can sign up for it at this link: http://www.isixsigma.com/newsletter 1 year, 5 months ago

You might want to check the news letter option for this site. As I understand it that is what the newsletter does. Try contacting the website for additional details. 1 year, 5 months ago

…one additional thought. With measurements in parts per billion/trillion you are sure to run up against roundoff error in whatever analysis program you are using. This will be true even if you have (as most programs do today) double precision. I would recommend you express the measures in scientific notation, drop the 10’s power and run th…[Read more]

Cpk = minimum (USLmean, mean – LSL)/(3*std)
Therefore, in order for Cpk to be negative your mean will have to either be less than the LSL or greater than the USL.
Sigma = minimum (USLmean, mean – LSL)/std
Therefore, if the mean is greater than USL then (USL – mean) will be the smaller value and it will be negative which means Sigma will…[Read more]

The short answer to your question is – your concern is really of no concern.
1. From Agresti Categorical Data Analysis 2nd Edition page 3
” Variables are classified as continuous or discrete, according to the number of values they can take. Actual measurements of all variables occurs in a discrete manner, due to precision limitations in…[Read more]

Please use data for your FMEA ratings.
Also, many pieces of equipment have recommended calibration frequencies that would be HARD to ignore. However, have you considered use of SPC for monitoring the measurement systems. This is a great tool to signal when calibrations are needed. 1 year, 6 months ago

Try working with a social organization you already are a participant. I’m sure every organization could use some volunteer talents. 1 year, 6 months ago
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