Quote from: LieBabyCryBaby on Dec 08, 2006, 04:44 PM
EosJ,
10% collateral damage is not acceptable, you're right. At least not when you are in that 10%. Sometimes I find it unacceptable too, I must confess. Whether passing polygraphs or administrating them, I've never had to face it from the side of the person falsely accused. Regardless of my ego, which I gladly admit, and despite Digithead's contrary opinion, I do feel sympathy for those treated with injustice.
That said, though, the agencies most polygraphers work for all want to get rid of the bad fish in the net, even if it means killing some of the good fish at the same time. When there are thousands of qualified applicants, and you have a process that you believe--rightly or wrongly--is correct most of the time, you use what you have. Is that unfair? Not to those hired, but it is unfair to those falsely accused, as well as to the rest of us when a truly bad fish escapes the net and swims in our waters. I just don't believe that either the false positive or the false negative happens as often as some of you would like to believe. Just because something may have happened to you doesn't make it a very common occurrence.
You are right about something else, I think: Maybe I haven't come across a truly prepared, determined person in an exam--a truly prepared person determined to beat the test despite past criminal behavior. And if I have, I didn't know it. What I have come across are people who are determined but not prepared, even though they've come here and read all of George's advice. Those people fail, after looking really stupid and being very embarrassed.
Quote from: EosJupiter on Dec 08, 2006, 08:52 PMLBCB,
The flaw with your reasoning that everyone has something criminal to hide, is just wrong.

Quote from: digithead on Dec 08, 2006, 05:49 AM
Similar stubborness exists in believers in other pseudosciences such as dowsers,...
Quote from: LieBabyCryBaby on Dec 07, 2006, 10:19 PMThis well-known saying is part of a phrase attributed to Benjamin Disraeli and popularized in the U.S. by Mark Twain:
"There are three kinds of lies: lies, damn lies, and statistics."
The semi-ironic statement refers to the persuasive power of numbers, and succinctly describes how even accurate statistics can be used to bolster inaccurate arguments.
Quote from: LieBabyCryBaby on Dec 07, 2006, 10:19 PM
Your statistics aren't that difficult to understand, so don't flatter yourself. But you are indeed making a simple concept difficult.
If I have a process that is correct 90% of the time, I am not looking at PPVs or NPVs or MVPs or VIPs. I'm not assuming anything about the sample of examinees we're talking about--not how many are truly deceptive or how many are not. What I do assume, based on studies used by "pro-polygraph" people and that support my own experience, is that the polygraph is correct almost all of the time. Set that "almost" at 90% or 80% or even 70%, and we can manipulate the statistics, playing with the theoretical base rates ad infinitum. But if I'm talking about 100 examinees and throwing out the inconclusives that we can't count as anything, what we have left is a 90% accuracy rate for all of those examinees, regardless of how many are actually false positives or false negatives. Why make it more complicated? Whether the examinees are all truthful or they're all a bunch of liars, I'm right 9 out of 10 times. Ooooh, I just converted that 90% to 9 out of 10, follow me? I can't assume that 99% of all child molesters are liars any more than I can assume that only 1% of job applicants are liars. If I start to make those assumptions, I can manipulate the statistics in . . . well, you figure how many ways.
Simply stated, if I test 100 examinees, throwing out any inconclusives, what I'm left with is 9 out of 10 correct.
Quote from: LieBabyCryBaby on Dec 07, 2006, 10:19 PM
Throw up all the smoke and mirrors you want, but underneath and behind it all, things are what they are, and I maintain that the polygraph, while imperfect, is almost always right.
Quote from: LieBabyCryBaby on Dec 07, 2006, 10:19 PM
I do sympathize with those people who are truly false positives.
Quote from: LieBabyCryBaby on Dec 07, 2006, 10:19 PM
I know they must be out there even if I haven't come across many, if any, in actual exams. And I also agree that a failed polygraph with one agency should not follow a person around.
Quote from: LieBabyCryBaby on Dec 07, 2006, 10:19 PM
If agencies are so confident in the process that is claimed to be 90% accurate when conducted by a competent examiner, I say let them run their own exam without prejudice.
Quote from: Sergeant1107 on Dec 07, 2006, 10:51 PM
If you believe this you have never had to interview any child molesters. All of them lie. Without exception.
Some of them mix in a very few truthful statements with their lies, and others mix in a great many truthful statements with their lies. But all of them lie.
Quote from: LieBabyCryBaby on Dec 07, 2006, 10:19 PMI can't assume that 99% of all child molesters are liars...If you believe this you have never had to interview any child molesters. All of them lie. Without exception.