Gauge Linearity and BiasWake up and smell your measuring system
Mon, 03/30/2015 - 16:02
Right now I’m enjoying my daily dose of morning joe. As the steam rises off the cup, the dark, rich liquid triggers a powerful enzyme cascade that jump-starts my brain and central nervous system, delivering potent glints of perspicacity into the… What Are T Values and P Values in Statistics?Meet the Tweedledee and Tweedledum of t-tests
Wed, 02/04/2015 - 11:42
If you’re not a statistician, looking through statistical output can sometimes make you feel a like you’ve wandered into Alice in Wonderland. Suddenly, you find yourself in a fantastical world where strange and mysterious phantasms appear out of… Why Kurtosis Is Like LiposuctionAnd why it matters
Thu, 09/25/2014 - 11:53
The word “kurtosis” sounds like a painful, festering disease of the gums. But the term actually describes the shape of a data distribution.
Frequently, you’ll see kurtosis defined as how sharply “peaked” the data are. The three main types of… Cuckoo for QualityA bird’s-eye view of a classic ANOVA example
Tue, 08/12/2014 - 15:21
If you teach statistics or quality statistics, you’re probably already familiar with the cuckoo egg data set.
The common cuckoo has decided that raising baby chicks is a stressful, thankless job. It has better things to do than fill the screeching… Why Is This Yorkie So Irritated? Oversimplified statistical models... <em>grrrr</em>
Mon, 06/23/2014 - 00:00
You know what really gets on my nerves? A lot of things.
That slow, slinky way that cats walk by. Grrrr.
The rude, abrupt arrival of delivery persons in their obnoxiously loud trucks. (Why do they always pull up just as I'm settling down for a nap… How a Poor Memory Helps to Model Failure DataThe forgetful (and helpful) characteristic of exponential distribution
Tue, 06/03/2014 - 13:45
These days, my memory isn’t what it used to be. Besides that, my memory isn’t what it used to be. But my incurable case of CRS (can’t remember stuff) is not nearly as bad as that of the exponential distribution.
When modeling failure data for… Equivalence Testing for Quality Analysis, Part TwoWhat difference does the difference make?
Wed, 04/09/2014 - 18:02
My previous article examined how an equivalence test can shift the burden of proof when you perform a hypothesis test of the means. This allows you to more rigorously test whether the process mean is equivalent to a target or to another mean.
Here… Equivalence Testing for Quality Analysis, Part OneWhat are you trying to prove?
Tue, 04/08/2014 - 15:47
With more options come more decisions. With equivalence testing added to Minitab 17, you now have more statistical tools to test a sample mean against target value or another sample mean.
Equivalence testing is extensively used in the biomedical… Doggy DOE, Part 3Analyze this!
Tue, 12/03/2013 - 10:13
What factors significantly affect how quickly my couch-potato pooch obeys the “lay down” command? The cushiness of the floor surface? The tone of voice used? The type of reward she gets? How hungry she is?
In part one we looked at the elements for… Doggy DOE, Part 2Create your design
Mon, 11/11/2013 - 12:23
Nala, our 6-year-old golden retriever, loves her dogma. That’s her sitting in front of church on Sunday morning. But she’s not crazy about her catechism. For example, she doesn’t always dutifully follow the “lay down” commandment.
What…
