Statistical Process Control-4

Summarization of Data

Types of Data

  • Attributes (non-measurable)
    • Go – No Go Gauge inspection
  • Count of defect (no. of defects)
    • No. of accepted or rejected items
  • Variables (measurable)
    • Measurement with the help of Instruments

Planning for Data Collection

  • What to collect ?
    •   Selection of suitable quality characteristics (variable/attribute)
  • How to Collect ?
    • Check Sheet
    • Measurement Process
    • Stratification (subgroup size)
    • Frequency
  • How much to collect
    • Objective of data collection
    • Cost of data collection
    • Technique used

Next:- Distribution


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