Case Study: MYCIN

• What were controls?

• Control for judge’s bias for/against computers

  • judges did not know who recommended each therapy

• Control for easy problems

  • medical student did badly, so problems not easy

• Control for our standard being low

  • e.g. random choice should do worse

• Control for factor of interest

  • e.g. hypothesis in MYCIN that “knowledge is power”
  • have groups with different levels of knowledge

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