Ken Feldman

The term standard order refers to the sequence of the runs you will do in your Design of Experiments. The question we will answer is whether to use the standard order or a random order.

The variance inflation factor measures the degree of multicollinearity of multiple predictor variables in a multiple linear regression. Holy smokes, that’s a lot of big words. Let’s find out what it all means.

If you hear someone say, “Darn, I didn’t expect that to happen”, they are probably experiencing an unintended consequence from some action they took. No one plans for things to go awry, but unfortunately, they do.

What do you picture when you hear the word stable? Words such as steady, consistent and minimal variation may come to mind. These words could also apply to your process. Let’s see what a stable process means. 

Webster’s dictionary defines stratification as: formed, deposited, or arranged in stable layers or strata. That’s interesting, but how does it apply to Six Sigma? Let’s find out.

Spread comes in a variety of forms. It refers to the variation of the data and can be calculated in a number of different ways. Let’s explore these.

It is important that you clearly specify your expectations about a company process or product. These detailed expectations are called specifications and serve as a guide as to how well you are satisfying both internal and external expectations. A specification (spec) is a detailed description of the requirements, characteristics, and features of a product, service, […]

Once in a lifetime, someone comes along who has a profound and transformational impact on society. Dr. W. Edwards Deming was such a person and his System of Profound Knowledge has had a significant impact on the business world.

When doing statistical analysis, it is impractical and often impossible to gather all the available data. That is when you would seek to sample the data to analyze it and make decisions about your process. In statistics, a sample refers to a group of individuals, objects, or events that are selected from a larger population […]

In the Analyze phase of DMAIC, you will want to identify possible independent or predictor variables to help explain the relationship with your response or dependent variables. Correlation is a statistical tool to establish the strength of the relationship between your independent and dependent variables. Regression is used to predict your response variable as a […]

The dictionary defines a response as a reaction to something. A response variable would be defined as the reaction or effect on a dependent variable as a result of an experimental manipulation of independent variables.  Response variable When discussing Design of Experiments (DOE) and Regression, you can talk about independent variables, also known as the […]

In the spirit of continuous improvement, re-engineering is the process by which you can identify, analyze, and re-design your organization’s core business processes for the purpose of achieving improvements in critical performance measures. Reengineering, also known as business process reengineering (BPR), is a methodology that focuses on the fundamental redesign of business processes to achieve […]

The shortest distance between two places is a straight line. Unfortunately, you can’t alway do that in your work environment. Let’s see how a spaghetti diagram might help visualize how things move through your workplace. 

It is said that a picture is worth a thousand words. You can also say a picture of your data is worth a thousand words. The stem and leaf plot is one such picture. 

In 1903, famed writer H.G. Wells first described the importance of mathematical analysis. Samuel Wilks, in 1951, paraphrased Wells and developed this famous quote: “Statistical thinking will one day be as necessary for efficient citizenship as the ability to read and write.” Let’s see why he said that.

Do you want to know whether your process is in control or not? Statistical Process Control, or SPC, is the tool you want to learn about, so let’s get started. 

When you speak of subgrouping, it is usually in the context of constructing a control chart. Let’s explore the topic in a little more detail. Subgrouping is a technique used in control charts to group data into smaller, more manageable sets or subgroups. The purpose of subgrouping is to increase the sensitivity of the control […]

Strategic planning is a formal, organized, proactive and structured process used by an organization to define its vision, goals, and objectives. The process of strategic planning also includes planning for, and the allocation of the resources needed to reach the stated goals and objectives of the organization. It is the roadmap for achieving your organization’s […]

So much to learn, and so little time to do it. The Six Sigma Body of Knowledge (SSBOK) is a collection of the tools and methodology of Six Sigma and serves as the base for most Six Sigma training and certifications.

When you hear the term residual, think of linear regression. It is the error of your prediction equation and has implications for the quality of your regression analysis. 

A scorecard in sports indicates which team is winning by monitoring an important metric such as number of runs, or baskets or touchdowns. Your business scorecard can provide valuable information on how your organization is doing. In business, a scorecard is a tool used to measure and track the performance of an organization or specific […]

It is usually impractical to measure everything if you are trying to collect data. That is why you will use an appropriate sampling technique. But how big a sample should you get? Using a sample size calculator will make that task quick and easy. Let’s see how. When you are required to collect data to […]

You want your processes to be able to still function well in the face of changes and variation. Let’s learn some more about how you can develop these robust processes. A robust process refers to a well-designed and reliable process that consistently delivers the desired outcomes, even in the face of variations, uncertainties, or challenges. […]

The creation of a rational subgroup is the key to the proper use of control charts. Let’s try to understand what makes them rational.