Tom Pyzdek’s picture

By Tom Pyzdek

The gold standard for modeling the future in a business environment is the designed experiment. Design of experiments (DOE) is a well-developed approach to planning and executing controlled manipulations.

Somewhat less respectable are models derived from historical data. It makes sense to utilize as much of this information as possible, but caution is required. Problems you may encounter are:

Tom Pyzdek’s picture

By Tom Pyzdek

The quality and process improvement professions tend to rely heavily on statistical information. The very science of quality control can be said to have begun with Walter A. Shewhart’s development of the control chart and discovery of the concepts of special cause and common cause variation. But few would argue with the statement that there is a downside, and a dark side, to statistics. I hereby present a few examples of good, bad, and ugly statistical usage.