They also cite the emotional trauma of a false positive, which would lead to other tests.
He said Williams, 36, may have been the victim of a false positive when tested 16 years ago.
Given that history, the odds were pretty high back in 1989 that the test result he received was a false positive.
The test is pretty reliable at detecting the disease, returning a false positive in just 1 in 5, 000 tests (a 99.98 percent accuracy).
The probability of a false positive in a chemical assay for a drug or poison (something appearing to show up when it isn't really there) is reasonably well known.
Although the contaminated bills do not affect health, Negrusz said, they could cause in a false positive drug test if a person, such as a law enforcement officer or banker, handles contaminated currency repeatedly.
And it produces a false positive fewer than three times in a million tries--compared with a hundred false positives in a million tries for an automated digital microscope on its own, the current, most accurate method.
If businesses choose, they can opt for single-factor authentication, though two-factor security is also an option -- as unique as the veins in your palm are, it's still possible for the reader to register a false positive.
The benefit was statistically significant, but the fact that the trial wasn't designed specifically to show it and the small size of the study (Taxotere was tested in 1, 000 men) increase the risk that the result is a false positive.
The Consumer Product Safety Commission said that they didn't find home test kits useful for detecting lead because in their test, they found too many false negatives and a few false positive test results.
Mark Monitor's Fred Felman says that his group targets more than 500 sites in a typical week and has never had a "false positive, "--in other words, has never mistaken a legitimate site for a phisher.
If you guess that it's a dangerous predator but it's just the wind, you've made a mistake believing that something is real when it's not (a "false positive, " as cognitive scientists call it) but a rather harmless one.
But since then, other analyses have shown the sensitive testing can sometimes have a false-positive.
Patients with high BMIs or with chest pain or pressure at presentation were less likely to have a false-positive activation.
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If one in 1, 000 people have a disease and the false-positive rate for a test is 5%, then the probability that a person testing positive has the disease is at most 2%.
The dichotomy between positive and negative liberty is in many ways a false one it is simply a moral debate over a list of things that we should be free from.
Now, a new studypublished in the Archives of Internal Medicine finds that the rate of false-positive activations is higher than expected.
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The American public was lulled into a false sense of security regarding the big banks because they reported, in some cases, positive earnings last quarter, Kramer says.
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