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Statistical Software for Serious Six Sigma Projects
When improving the quality of goods and services, almost any statistics software will capture the "low-hanging fruit". Attaining continuous improvement is more difficult. It is then that software designed for textbook problems needs to be replaced with other tools.
OUTLIERS
Everyone who analyzes data has been faced with the problem of determining whether or not an apparent abnormality should be left in the data set or removed. The implications of wrongly making either decision can be serious. While no statistical technique can answer that question with certainty, the STATGRAPHICS Centurion Outlier Identification procedure provides important tools to deal with outliers:
Grubbs', Dixon's, and Tukey's tests examine the most extreme values to determine whether they come from...