Discrete and Continuous Data – Recognizing the Difference

The choice of which statistical test to use is often determined in part by whether the data is continuous or discrete.  Our Green Belt course includes an exercise where students are asked to convert continuous data into discrete categories.  For example, time to complete a transaction is continuous data.  Discrete categories for delivering a package […] read more

On September 7th, 2019, posted in: Project Management by Tags: , ,

Who is the Customer in a Non-Profit Organization?

Our Yellow Belt course includes an assignment that challenges students to think about improving the processes that serve their customers.  One of my Yellow Belt students works for a non-profit foundation that raises funds that are used for providing scholarships to students and grants to educators.  She recently submitted the following statement: “My organization’s customers […] read more

On May 5th, 2019, posted in: Project Management by Tags: , ,

Process Capability Studies Using One-Sided Specifications

Process capability studies calculate the process capability indices Cp and Cpk.  These statistics tell us how well the process is meeting specifications or requirements.  Capability studies are designed for two-sided specifications that have an upper and a lower limit.  Adjustments must be made when we have a one-sided specification and/or a boundary limit in place […] read more

On April 27th, 2019, posted in: Project Management by Tags: ,

With Data, Anything Can Happen!

In article 73 in this series, I discussed the issue of whether to transform data.    Students of Six Sigma often think (incorrectly) that there is something inherently wrong with their data if it is not normally distributed.  We should always strive to understand why the data is distributed the way it is and recognize that […] read more

On April 10th, 2019, posted in: Project Management by Tags: ,