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Guest Blogger

Blog posts from people who are applying statistics and data analysis to their quality improvement projects and personal interests. Would you like to submit a post? Contact publicrelations(at)minitab.com 

by Jasmin Wong, guest blogger   Part 1 of this two-part blog post discusses the issues and challenges in injection moulding and suggests using simulation software and the statistical method called Design of Experiments (DOE) to speed development and boost quality. This part presents a case study that illustrates this approach.  Preliminary Fill and Designed Experiment This case study considers the... Continue Reading
by Jasmin Wong, guest blogger The combination of statistical methods and injection moulding simulation software gives manufacturers a powerful way to predict moulding defects and to develop a robust moulding process at the part design phase.  CAE (computer-aided engineering) is widely used in the injection moulding industry today to improve product and mould designs as well as to resolve or... Continue Reading

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by The Discrete Sharer, guest blogger As Minitab users, many of us have found staged control charts to be an effective tool to quantify and demonstrate the “before and after” state of our process improvement activities. However, have you ever considered using them to demonstrate the effects of changes to compensation/incentive plans for your employees?  Here's an example of how a mid-sized... Continue Reading
by Lion "Ari" Ondiappan Arivazhagan, guest blogger In India, we've seen this story far too many times in recent years: Timmanna Hatti, a six-year old boy, was trapped in a 160-feet borewell for more than 5 days in Sulikeri village of Bagalkot district in Karnataka after falling into the well. Perhaps the most heartbreaking aspect of the situation was the decision of the Bagalkot district... Continue Reading
by Iván Alfonso, guest blogger I'm a huge fan of hot cakes—they are my favorite dessert ever. I’ve been cooking them for over 15 years, and over that time I’ve noticed many variation in textures, flavor, and thickness. Personally, I like fluffy pancakes. There are many brands of hotcake mix on the market, all with very similar formulations. So I decided to investigate which ingredients and inputs... Continue Reading
by Matthew Barsalou, guest blogger  I told a friend about my interest in statistics, and he immediately told me a joke about broiled chicken and statistics. The punch line involved my friend getting to eat all the chicken. Unfortunately, I forgot the rest of the joke. I can, however, assure you it was a very funny statistics-related joke. People often make jokes when I mention my interest... Continue Reading
by Matthew Barsalou, guest blogger Programs such as the Minitab Statistical Software make hypothesis testing easier; but no program can think for the experimenter. Anybody performing a statistical hypothesis test must understand what p values mean in regards to their statistical results as well as potential limitations of statistical hypothesis testing. A p value of 0.05 is frequently used during... Continue Reading
by Laerte de Araujo Lima, guest blogger In a previous post (How Data Analysis Can Help Us Predict This Year's Champions League), I shared how I used Minitab Statistical Softwareto predict the 2013-2014 season of the UEFA Champions league. This involved the regression analysis of main critical-to-quality (CTQ) factors, which I identified using the “voice of the customer” suggestions of some... Continue Reading
by Matthew Barsalou, guest blogger I recently moved, and right after finishing the less-than-joyous task of unpacking I decided to take and break and relax by playing with Minitab Statistical Software.   As a data source I used the many quotes I received from moving companies. I'd invited many companies to look around my previous home, and then they would provide me an estimate with the price... Continue Reading
by Arun Kumar, guest blogger One of the most commonly used statistical methods is ANOVA, short for “Analysis of Variance.” Whether you’re analysing data for Six-Sigma styled quality improvement projects, or perhaps just taking your first statistics course, a good understanding of how this technique works is important. A lot of concepts are involved in any analysis using ANOVA and its subsequent... Continue Reading
by Laerte de Araujo Lima, guest blogger A few weeks ago, my football friends and I were talking about the football in the UEFA Champions league (UEFA CL), and what we could expect for the 2013-14 season. Some of us believe that the quality of the football played in the UEFA CL has improved in the last few years, as evidenced by more goals per match, more teams with strategies based in the attack... Continue Reading
by Matthew Barsalou, guest blogger The field of statistics has a long history and many people have made contributions over the years. Many contributors to the field were educated as statisticians, such as Karl Pearson and his son Egon Pearson. Others were people with problems that needed solving, and they developed statistical methods to solve these problems. The Standard Normal Distribution One... Continue Reading
by Jeff Parks, guest blogger Being a Cincinnati Bengals fan is tough. It's true that Bengals fans don't have it as bad as, say, long-suffering Chicago Cubs fans...nevertheless, the Bengals haven’t won a playoff game since January 1991. That's currently the longest streak in the NFL. In the 1990s they were voted the worst sports franchise by ESPN. Not the worst football team, mind you, but the worst... Continue Reading
by Dan Wolfe, guest blogger How would you measure a hole that was allowed to vary one tenth the size of a human hair? What if the warmth from holding the part in your hand could take the measurement from good to bad? These are the types of problems that must be dealt with when measuring at the micron level. As a Six Sigma professional, that was the challenge I was given when Tenneco entered into... Continue Reading
by Cory Heid, guest blogger A few months ago I posted a blog about Tootsie Pops and how many licks it takes to get to the Tootsie Roll center. If you haven’t read the post, here's a quick summary. Recap of Initial Study I broke down my experiment into four parts where I would test: the force of a lick temperature of a person's mouth pH level of a person's saliva the solubility of a person's saliva After... Continue Reading
by Matthew Barsalou, guest blogger In the 1935 book The Design of Experiments, Ronald A. Fisher used the example of a lady tasting tea to demonstrate basic principles of statistical experiments. In Fisher’s example, a lady made the claim that she could taste whether milk or tea was poured first into her cup, so Fisher did what any good statistician would do—he performed an experiment. The lady in... Continue Reading
by Matthew Barsalou, guest blogger A good way to begin researching a topic is with exploratory data analysis (EDA). In his 1977 book Exploratory Data Analysis, John Tukey suggested using EDA to collect and analyze data—not to confirm a hypothesis, but to form a hypothesis that could later be confirmed through other methods. In some cases, EDA can even eliminate the need for a more in-depth... Continue Reading
by Bob Yoon, guest blogger Yesterday's post shared how an analysis of Bill Belichick's hoodie-wearing patterns found no statistically significant difference in New England Patriots wins if he wore sleeved or sleeveless hoodies, nor if the hoodie were from Reebok or Nike. Since these hypothesis tests failed to reject the null hypothesis, I combined these factors under “grey hoodie” and started a new... Continue Reading
by Bob Yoon, guest blogger As a longtime Boston sports fan, these past 12 years have spoiled me for the rest of my life—seven titles amongst all four of the major sports teams and over 30 playoff berths. This era of dominance began with the New England Patriots, and the one man at the center of the team’s ascent to greatness is Coach Bill Belichick. Over the years, his choice in wardrobe has... Continue Reading
by Alex Orlov, guest blogger While it has been called the "million-dollar methodology" for the significant investment sometimes required to deliver results, Six Sigma has a wealth of practices that can be adapted to small and medium industries, home businesses and even personal finances.  Organizations have used Six Sigma as a reliable part of the quality improvement process since 1986. And while a... Continue Reading