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IE 327 Introduction to Work Design Dr. Andris Freivalds Class #12

IE 327 Introduction to Work Design Dr. Andris Freivalds Class #12. Ch. 7 – Design of Cognitive Work (Information Theory). Bit = binary unit = amount of information from two choices (e.g. coin toss, hi/lo). Bit = binary unit = amount of information

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IE 327 Introduction to Work Design Dr. Andris Freivalds Class #12

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  1. IE 327 Introduction to Work Design Dr. Andris Freivalds Class #12 IE 327

  2. Ch. 7 – Design of Cognitive Work(Information Theory) • Bit = binary unit = amount of information from two choices (e.g. coin toss, hi/lo) IE 327

  3. Bit = binary unit = amount of information from two choices (e.g. coin toss, hi/lo) • H = log2 n log2 n = 1.4427 ln n • (n = # equally likely alternatives) IE 327

  4. Information Theory (con’t) • H = ∑pi log2 (1/pi) (not equally likely) • Redundancy = reduction of information %R = (1 – H/Hmax)x100 • Bandwidth = channel capacity = maximum amount of information processed IE 327

  5. Human Information Processing Model IE 327

  6. Perception and Signal Detection Model • Explains: • Perception of information • When noise present • Four conditions: • Hit = ‘yes’ on signal • Correct rejection (CR) = ‘no’ when no signal • False alarm (FA) = ‘yes’ when no signal • Miss = ‘no’ on signal IE 327

  7. Signal Detection Model IE 327

  8. SDT and Inspection • Response criterion = mental standard of judgment of signal • Move left → ↑ hits, but also ↑ FA (liberal) • Move right → ↓ FA, but also ↓ hits (conservative) • d’ = separation of signal and noise distributions – increase if possible!! IE 327

  9. Ex. SDT and Accuweather IE 327

  10. IE 327

  11. Ex. SDT and JoBlo IE 327

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