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Ordered category data is discrete data representing appraiser or client perception against a rating scale such as a survey or questionnaire. Black Belts learning to apply the Six Sigma methodology to ordered category data are traditionally taught analytical methods that include normal and Poisson distributions. This is probably due to Six Sigma's beginnings in manufacturing. These methods are not as useful in the services sector as most of the data is discrete. However, there are alternate methods for analyzing discrete ordered category data that are specifically useful when structuring voice of the client processes.
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