F09SESS9 6s - IE/PSY 577 Session 9 Example: Screening...

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1 IE/PSY 577 Session 9 Signal Detection Theory 2 IE/PSY 577 Session 9 Developed in electrical engineering and based on statistical decision theory First applied to human perceptual discrimination in 1950s Assumes that decisions are involved even in simple discrimination tasks. Provides a means for separating decision criteria from discriminability Applied to a variety of problems measuring accuracy of diagnostic systems reliability of lie detection tests 3 IE/PSY 577 Session 9 Detection of signals is crucial to the performance of many tasks: Quality-control inspector examining products for defects Detection of a flashing warning light by an operator Airport security guard inspecting luggage for weapons 4 Example: Screening luggage at an airport for weapons Actual State Signal (signal+noise): Weapon in a suitcase Noise: Items that look like a weapon in a suitcase Response of Screener “Yes” signal (weapon) is present “No” signal (weapon) is not present 5 IE/PSY 577 Session 9 General idea behind signal detection methods Trials Signal (signal+noise) Noise
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This note was uploaded on 11/04/2010 for the course IE / PHYS 557 taught by Professor Staff during the Fall '08 term at IUPUI.

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F09SESS9 6s - IE/PSY 577 Session 9 Example: Screening...

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