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AntiPolygraph.org Message Board › Polygraph and CVSA Forums › Polygraph Procedure › Understanding polygraphy

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Understanding polygraphy (Read 2826 times)

nopolycop Especially Senior User Offline Posts: 383 Joined: Oct 20^th, 2007	Understanding polygraphy Oct 24^th, 2007 at 2:53pm	Mark & Quote Quote Print Post
	Is it my understanding that the polygraph examiner himself determines how much variance in the chart readings in order to determine deception or no deception? I ask this based on the following lineini Mr. Hont's study regarding countermeasures: "Followng the data collection, the examiner ran the CPS discriminant analysis classification software . . . . Participants who produced probabilities of trthfulness of .7 or greater were told they passed and were given the movie pass bonus." So, what does this mean in layman's terms?

	"Although the degree of reliability of polygraph evidence may depend upon a variety of identifiable factors, there is simply no way to know in a particular case whether a polygraph examiner's Conclusion is accurate, because certain doubts and uncertainties plague even the best polygraph exams." (Justice Clarence Thomas writing in United States v. Scheffer, 523 U.S. 303, 118 S.Ct. 1261, 140 L.Ed.2d 413, 1998.)
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raymond.nelson User Offline If you win the rat race, you're still a rat. Posts: 46 Joined: Oct 22^nd, 2007	Re: Understanding polygraphy Reply #1 - Oct 24^th, 2007 at 3:58pm	Mark & Quote Quote Print Post
	You cannot reasonably expect, in this forum, a primer on discriminate analysis, likelihood ratios or bayesian probabilities. More succinct questions would be in order. For basic information, of which there is sometimes a lot, you can refer to any advanced statistics texts or treatises. However, many find it easier to learn about statistics in a classroom with other students vs. self study. r


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nopolycop Especially Senior User Offline Posts: 383 Joined: Oct 20^th, 2007	Re: Understanding polygraphy Reply #2 - Oct 24^th, 2007 at 6:22pm	Mark & Quote Quote Print Post
	raymond.nelson wrote on Oct 24^th, 2007 at 3:58pm: You cannot reasonably expect, in this forum, a primer on discriminate analysis, likelihood ratios or bayesian probabilities. More succinct questions would be in order. For basic information, of which there is sometimes a lot, you can refer to any advanced statistics texts or treatises. However, many find it easier to learn about statistics in a classroom with other students vs. self study. r Thank-you Mr. Nelson for your comments. Based on your response, I guess there is no way to discuss this in laymans terms.

	"Although the degree of reliability of polygraph evidence may depend upon a variety of identifiable factors, there is simply no way to know in a particular case whether a polygraph examiner's Conclusion is accurate, because certain doubts and uncertainties plague even the best polygraph exams." (Justice Clarence Thomas writing in United States v. Scheffer, 523 U.S. 303, 118 S.Ct. 1261, 140 L.Ed.2d 413, 1998.)
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raymond.nelson User Offline If you win the rat race, you're still a rat. Posts: 46 Joined: Oct 22^nd, 2007	Re: Understanding polygraphy Reply #3 - Oct 24^th, 2007 at 7:08pm	Mark & Quote Quote Print Post
	No.


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Understanding polygraphy

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