Six Sigma Archives | Page 3 of 4

How beer influenced statistics

By Ron Pereira - June 20th, 2007

Back in the early 1900s a certain W.S. Gosset, an Englishmen, was tasked with brewing better beer. Really, I’m being serious. Gosset was a bright man, with two degrees from Oxford, and was hired by Guinness to help them brew

5 Steps to Data Collection

By Ron Pereira - May 31st, 2007

In most Six Sigma training programs and text books you will hear about a 5 step data collection process. However, what they don’t tell you is that collecting data is tricky. Many people think they can simply run off and gra

Repetitions versus Replications

By Ron - May 8th, 2007

Many Lean & Six Sigma practitioners struggle to differentiate between a repetition and replication. Normally this confusion arises when dealing with Design of Experiments (DOE). Let’s use an example to explain the difference. Pai

Taguchi Index – Cpm

By Ron - April 16th, 2007

Last night we discussed the Taguchi Loss Function and how Taguchi methods are more concerned with hitting the target compared to more traditional methods that often focus on keeping our data between the upper and lower specification li

Taguchi Loss Function

By Ron - April 15th, 2007

Saying the words “Genichi Taguchi” to a hard core “western statistician” may get you some dirty looks. Actually, some of these crazy statisticians may want to strike you for saying this person’s name. Why the hate you may ask

Span – GE’s Variation Weapon

By Ron - April 12th, 2007

GE is arguably one of the best examples of Six Sigma excellence today. An often heard phrase is, “Motorola invented Six Sigma and GE perfected it.”A slick “variation weapon” GE has developed is called Span. I have never worked

Demystifying Design of Experiments

By Ron - March 19th, 2007

I love Design of Experiments (DOE). Over the years I have done my fair share of them – everything from simple 2^2 full factorial designs to your more complicated Response Surface Methodology designs. Tonight I want to start by explai

Regression – Part 3

By Ron - March 6th, 2007

This evening we will wrap up our discussion of regression. So far we have discussed what regression is and a few ways to determine whether our model is significant. Next up I want to discuss something called the least squares method an

Hypothesis Testing

By Ron - February 27th, 2007

One of my favorite statistical tools is hypothesis testing. We can use hypothesis testing for many purposes. For example, we would use the popular 2-sample t-test when we have two samples of variable data and want to understand if they

Control Charts – Part 3

By Ron - January 31st, 2007

Hello friends! This is the 3rd and final installment of all you wanted to know about control charts but were afraid to ask. In part 1 of the series we talked about the history and purpose of control charts. In part 2 we discussed three

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