2.3. Types of Variables
Numerical information collected about a product, service, process, individual, or item is called data. Because no two things are exactly alike, data inherently varies. Each characteristic of interest is referred to as a variable. In Six Sigma, the term CTQ is used as an acronym for critical-to-quality characteristics for a product, service, or process. In addition, the term CTP is used as an acronym for a critical-to-process characteristic in the design of a product or service. Data are classified into two types: attribute data and measurement data.
Attribute data (also referred to as categorical or count data) occurs when a variable is either classified into categories or used to count occurrences of a phenomenon. Attribute ...
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