Estimating the Accuracy of Polygraph Test

엄진섭; 지형기; 박광배

Korean Psychological Journal of Culture and Social Issues

P-ISSN1229-0661
E-ISSN1229-0661
KCI

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Vol.14 No.4

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Estimating the Accuracy of Polygraph Test

Korean Psychological Journal of Culture and Social Issues / Korean Psychological Journal of Culture and Social Issues, (P)1229-0661; (E)1229-0661

2008, v.14 no.4, pp.1-18

& (2008). Estimating the Accuracy of Polygraph Test. Korean Psychological Journal of Culture and Social Issues, 14(4), 1-18.

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Abstract

The present study examined the accuracy of polygraph tests through two types of statistical methods with unknown ground truth. One method evaluated the accuracy based on the rates of agreements between polygraph test results of crime suspects and prosecutors' indictment decisions for them. Those crime suspects were tested with polygraph by the Prosecutors' Office of the Republic of Korea between 2000 and 2004. The other method estimated the accuracy by using the latent class analysis based on the frequency distributions of the polygraph results and indictments during 2006. Excluding cases that were ‘inconclusive’ on the polygraph test, the study showed that the accuracy of the polygraph tests is .914 (SE=.004) for the 2000-2004 data, and .885 (SE=.021) for the 2006 data. With the inclusion of ‘inconclusive’ cases in the 2006 data, the results from the latent class analysis showed the accuracy in the range between .707 and .734 (SE=.027~.031), with false positives between .078 and .087 (SE=.019~.023), and false negatives between .029 and .078 (SE=.010~.023). The probability that the polygraph test correctly classifies subjects appeared to be in the range between .912 and .925 (SE=.013-.016) for those who lie, and in the range between .867 to .955 (SE=.011-.040) for those who tell the truth.

keywords: polygraph, lie detection, accuracy, validity, latent class analysis, 폴리그라프, 거짓말 탐지, 정확도, 타당도, 잠재계층분석

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Article Contents

Vol.14 No.4

Estimating the Accuracy of Polygraph Test

Abstract

Reference

Korean Psychological Journal of Culture and Social Issues