anecdotal evidence

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anecdotal evidence

Evidence based on the occurrence of single unique event (e.g., a case report of an unusual medical finding or response to a therapy).

Anecdotes are extremely weak support of a theory; even if the event itself has been verified, its occurrence may be inappropriately attributed to an unusual therapy, and other unrecognised factors (confounders) may have invalidated the initial prediction of demise. Multiple similar anecdotes do not significantly increase support and at best serve justify a scientific experiment to empirically test the theory.

anecdotal evidence

Evidence based on anecdotes arising from the analysis of individual clinical cases, rather than the study of scientifically randomized groups of patients. Such evidence may be true or false, but it is always unreliable because it is based on hearsay, faulty reasoning, or other cause.
See also: evidence

anecdotal evidence,

n information obtained from personal accounts, examples, and observations. Usually not considered scientifically valid but may indicate areas for further investigation and research.
References in periodicals archive ?
We have also gotten anecdotal reports of people using quetiapine on the outside and mixing it with other drugs, particularly cocaine," Dr.
Because of these findings and anecdotal reports of deer ticks in Cook County, we also surveyed 3 sites in Cook County during the fall of 2005.
Swiss experts investigated the therapeutic value of the didgeridoo after hearing anecdotal reports of how playing the instrument could reduce snoring.
Preliminary accountability data as well as anecdotal reports from counselors indicated that providing services to the high-risk middle school students was simultaneously rewarding and frustrating.
There were, however, many anecdotal reports of improved handwriting and other aspects of motor coordination, which led the researchers to state that more research is necessary to assess that aspect.
Despite anecdotal reports the number of potential buyers may be diminishing, actual sales transactions have not slowed.
There has been anecdotal reports about price-gouging, but that has been far and few between,'' Schunhoff said.
They also cited some anecdotal reports that the use of the harmonic scalpel was associated with a decrease in postoperative pain among patients who had undergone procedures such as breast biopsy, hernia repair, and prostatectomy.
To document the effects of this approach, Ranney presents anecdotal reports of the residential displacement of low-income blacks by the gentrification of Chicago's inner-city communities.
Researchers have suspected for some time, based on anecdotal reports, that blueberries may help to reduce cholesterol.
In 2003 digital camera sales grew by 64 percent over 2002 figures to more than 50 million units, according to Photo Marketing Association estimates, with anecdotal reports of some users bringing their photo printers to weddings to surprise newlyweds with photos of the event before they leave on their honeymoon.
There have been anecdotal reports of dentists and physicians being sued by women who became pregnant while on antibiotic therapy.