statistics Archives | Gemba Academy

Calculating Rolled Throughput Yield (RTY)

By Ron Pereira - September 12th, 2007

One of the most powerful operational metrics I know of is Rolled Throughput Yield (RTY). It’s used to assess the “true” yield of a given process. This includes what we often call the “hidden factory” t

Fun with Confidence Intervals – Part 2

By Ron Pereira - August 30th, 2007

Last night we began our discussion on confidence intervals. Specifically, we talked about the difference between population and sample parameters and how they play a major role in understanding what a confidence interval is. Tonight I

Explaining the Central Limit Theorem

By Ron Pereira - July 16th, 2007

If you hate statistics this post is for you. Why? Because it’s my intention to have you understand AND be in position to teach others one of the more complicated and misunderstood statistical concepts of our time – the central

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

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

The Heated Law of Dispersion

By Ron - January 16th, 2007

One debate that often arises amongst my Six Sigma cohorts is when to use the standard deviation of a dataset and when we should use another measure of dispersion, namely the range. Descriptive Statistics Overview Let’s take a quick r

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