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## The Polygraph and Lie Detection (2003) Board on Behavioral, Cognitive, and Sensory Sciences (BBCSS)Committee on National Statistics (CNSTAT)

### Citation Manager

. "Appendix I: False Positive Index Values for Polygraph Testing." The Polygraph and Lie Detection. Washington, DC: The National Academies Press, 2003.

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The Polygraph and Lie Detection

TABLE I-1A Values of the False Positive Index with Decision Thresholds Set for 80 Percent Sensitivity

 Base rate A = 0.90 A = 0.80 A = 0.70 A = 0.60 0.001 208 452 634 741 0.01 21 45 63 73 0.10 1.9 4.1 5.7 6.7 0.50 0.21 0.45 0.63 0.74

TABLE I-1B Values of the False Positive Index with Decision Thresholds Set for 50 Percent Sensitivity

 Base rate A = 0.90 A = 0.80 A = 0.70 A = 0.60 0.001 70 232 411 545 0.01 7.0 23 41 54 0.10 0.63 2.1 3.7 4.9 0.50 0.07 0.23 0.41 0.55

TABLE I-1C Values of the False Positive Index with Decision Thresholds Set for 20 Percent Sensitivity

 Base rate A = 0.90 A = 0.80 A = 0.70 A = 0.60 0.001 20 104 240 370 0.01 2.0 10 24 37 0.10 0.18 0.94 2.2 3.3 0.50 0.02 0.10 0.24 0.37

positive index (FPI) from assumptions about the base rate of deceptive examinees in a population to be given polygraph tests, the level of accuracy achieved by the polygraph, and the decision threshold, defined in terms of the sensitivity, or proportion of deceptive individuals to be identified correctly. The figures show values for accuracy rates (A) of 0.90, 0.80, 0.70, and 0.60 and sensitivities of 80, 50, and 20 percent. The figures are based on the binormal, equivariance model and are presented on logarithmic scales to make it easier to get accurate readings for very low base rates than is possible with standard scales such as presented in Figures 7-1 and 7-2.

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 Front Matter (R1-R18) Executive Summary (1-10) 1 Lie Detection and the Polygraph (11-28) 2 Validity and Its Measurement (29-64) 3 The Scientific Basis for Polygraph Testing (65-105) 4 Evidence from Polygraph Research: Qualitative Assessment (106-120) 5 Evidence from Polygraph Research: Quantitative Assessment (121-153) 6 Alternative Techniques and Technologies (154-177) 7 Uses of Polygraph Tests (178-211) 8 Conclusions and Recommendations (212-231) References (232-252) Appendix A: Polygraph Questioning and Techniques (253-258) Appendix B: Use of Polygraph Screening in the U.S. Department of Energy and Other Federal Agencies (259-279) Appendix C: The Wen Ho Lee Case and the Polygraph (280-285) Appendix D: Physiological Processes Measured by the Polygraph (286-290) Appendix E: Historical Notes on the Modern Polygraph (291-297) Appendix F: Computerized Scoring of Polygraph Data (298-322) Appendix G: Process for Systematic Review of Polygraph Validation Studies (323-339) Appendix H: Quantitative Assessment of Polygraph Test Accuracy (340-353) Appendix I: False Positive Index Values for Polygraph Testing (354-357) Appendix J: Decision Analysis of Polygraph Security Screening (358-363) Appendix K: Combining Information Sources in Medical Diagnosis and Security Screening (364-374) Appendix L: Biographical Sketches of Committee Members and Staff (375-380) Index (381-398)