QI Macros Announces Levene's Test for Excel

The QI Macros SPC Software for Excel announces the addition of Levene's Test of variance in normal and non-normal data. One of the keys to Six Sigma in manufacturing and service industries is the reduction of variation. To do this, employees compare two or more methods, machines or materials to find the optimum. While the standard statistical F-test can evaluate differences in variability between two samples of normal (i.e., "bell shaped") data, Levene's test can evaluate variation across two or more samples of non-normal data. What is an example of non-normal data? Skewed (i.e., leaning) data like customer wait times in a bank: most are close to a minute or less, but a few may take 25 minutes or more.

The QI Macros SPC Software works in Excel 97-2007 and is available for immediate download. The QI Macros have been simplifying process improvement and Lean Six Sigma for tens of thousands of customers since 1996.  Thousands of hospitals use the QI Macros to improve clinical outcomes and patient flow. Thousands of businesses ranging from automotive suppliers to state and Federal government use the QI Macros to help reduce costs and boost productivity and profitability.

The QI Macros are the “Swiss Army Knife” of tools for companies embracing Lean Six Sigma which combines the speed and quality of the Toyota Production System (TPS). The QI Macros are an addin for Microsoft Excel that does the math and draws the graphs required for SPC—Statistical Process Control. It also includes fill-in-the-blank templates for more exotic Six Sigma tools like Design of Experiments (DOE) and Quality Function Deployment (QFD)—two key elements of Design for Six Sigma.

Readers can download a free, 30-day evaluation copy and user guide at www.qimacros.com/freestuff.html. They can also signup for our free Lean Six Sigma Lessons on line and webinars. The QI Macros SPC Software contains 30+ charts and over 80+ fill-in-the-blank templates for simplifying the complexities of Lean Six Sigma. And at only $139 +S&H, they are the least expensive, most robust solution available on the market