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Data Analysis October 7, 2007

Posted by Coolguy in Six Sigma Measure Phase.

Types of data:

  1. Attribute data : Integers, discrete, less complex skill levels, less storage, less desirable
    • E.g:Defects, scratches etc
  2. Variable data: Real numbers, continuous, more complex skill levels, more storage, more desirable
    • E.g: Inches, PSI, Total scratch length etc
  3. Locational data

Measurement scales (In increasing scale of desirability) :

  • Nominal : No ordering possible
  • Ordinal: Data is arranged in order but meaningless order
  • Interval: Data is in order and differences can be found. But no starting or end points.
  • Ratio: Has starting and end point.

Data collection methods

  • Automatic
  • Manual

Data coding:

  • Add, Subtract, Multiply coding
  • Coding by substitution
  • Coding by truncation


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