A spam that's incorrectly classified as ham. Also abbreviated as "fn" or "FN".
(also called type II error or beta error) - A statement that a substance is not present (was not found) in a sample when the substance was present (Keith, 1992).
A test result that wrongly shows an effect to be absent.
A false negative is an email that has NOT been marked as spam that really is spam. Related Words: False Positive.
Some women are told that tests have shown that their baby does not have a particular problem, only to find out when the baby is born that this is not true. This is called a false negative result and is not a common occurrence.
Does have the abnormality or disease and is incorrectly classified by the test.
Term used to describe an incorrect test result of a medical procedure or test that falsely shows the lack of a finding. For example, a mammogram may not show any breast abnormality, yet breast cancer is present. The mammogram result is a false negative. A false negative result can occur for a variety of reasons, including operator error or limitations of the test.
an email that is spam, but which was not recognized by an anti-spam solution and was released to your inbox as legitimate email
an unmatched target string that denotes the same entity as the pattern, and a true negative is an unmatched target string that does not
a type of error in which an individual is predicted to fail but actually succeeds if given a chance
a blood test for HIV that does not reveal the presence of HIV in a person with HIV; this may happen if the test is done before the person with HIV has developed detectable antibodies.
when a screening test suggests that a baby has a low risk of a condition which it later turns out to have.
The situation that occurs when a test indicates the person being assessed does not have a disease when they actually do.
The rate of occurrence of negative test results in subjects known to have the disease or behavior for which the individual is being tested (see Table I).
When spam-filtering devices fail to detect spam and allow it to be delivered.
False positive Familial adenomatous polyposis Familial cancer Family medical history Family Tree -- see Pedigree FAP -- see Familial adenomatous polyposis Fecal occult blood test Feces -- see Stool First degree relative Flexible sigmoidoscope -- see Sigmoidoscope FOBT -- see Fecal occult blood test Fundic gland -- see Gastric fundic gland
When a test wrongly shows an effect or condition to be absent (e.g., that a woman is not pregnant when, in fact, she is).
When someone tests negative for a condition that they have.
A determination that a material is nontoxic when it is in fact toxic.
An email that is marked as legitimate, even though it is spam.
A false negative error occurs when anti-virus software fails to indicate an infected file is truly infected. False negatives are more serious than false positives, although both are undesirable. False negatives are more common with anti-virus software because the may miss a new or a heavily modified virus. See Also: False Positive
an incorrectly negative answer on a given medical test. This gives the physician the impression that a given disease has been ruled out, but this is not true.
Test results that miss cancer when it is present.
A test result that incorrectly says the analyte, disease, or condition is not present when it actually is present. False negatives can be due to human error, test error, or substances in the sample that interfere with the test. EXAMPLE: A woman who is pregnant receives a test result saying that she is not pregnant.
A false negative occurs when a real intrusion has occurred but the system allows it to pass and false to respond.
test result implying a condition does not exist when in fact it does.
An erroneous result of a drug test that indicates the absence of a drug that is actually present.
an experimental outcome that incorrectly yields a negative result. False negatives can complicate disease diagnosis.
An erroneous negative test result. For example, an imagine test that fails to show the presence of a cancer tumor later found by biopsy to be present in the patient is said to have returned a false negative result.
This means that a test has shown that a disease is not present when in fact it is.
An error in which the decision maker predicts something will not occur, but it does occur. Also known as a Type 1 error 37, 53
A test result that is read as negative when the disease is present.
In the anti-spam application, when spam slips through your filter and winds up in your inbox.
A test result that indicates the absence of a condition when the condition is actually present (group ?C? in Table I). The rate of occurrence of false negative results varies with the diagnostic accuracy and the specificity of the test or procedure. As the accuracy and specificity of a test increases, the rate of false negatives decreases. Certain tests are known to yield false negative results at a certain rate; in all tests, a small number of false negatives will occur by chance alone.
A test result that is not correct. This may be a result of performing the test incorrectly or using a test that is not accurate. A false negative test in HIV would be a test that is negative in a person who is actually infected.
A result that appears negative but fails to reveal a situation. An example of a false negative: a particular test designed to detect cancer of the toenail is negative but the person has toenail cancer. See the entire definition of False negative
Een false negative is wanneer uw anti-spam software faalt om een spam boodschap als spam te identificeren.