anecdotal evidence

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Related to Anecdotal report: anecdotal record

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 ?
He says that third-party anecdotal reports suggest that Apple is increasing the frequency of changes and corrections.
The Beige Book is based on anecdotal reports from businesses and will be considered along with other data when Fed policymakers meet April 29-30.
The study seems to confirm anecdotal reports that spelunkers in lightless caves often are able to see their hands.
The research is a major step forward in showing that omega-3 fatty acids, either sourced from fish oil or flax oil, may help to slow down the progression of osteoarthritis, or even prevent it occurring, confirming anecdotal reports and "old wives' tales" about the benefits of fish oil for joint health.
The researchers conducted the study to try to objectively quantify improvements in attractiveness after surgery, which are often subjective and based on anecdotal reports.
Analyses were extensively adjusted, and the results are in line with anecdotal reports of serious and sometimes lethal statin toxicity in older adults given erythromycin or clarithromycin.
Anecdotal reports had suggested that flu vaccination during gestation might have adverse effects on the fetus, but the new study--as well as two previous reports, from Canada and Denmark--shows no such connection.
Anecdotal reports and early research show that one hour of humming can improve sinus pain.
There's a huge push to initiate trials for its use in these circumstances in the US, but only a few anecdotal reports and small objective studies exist.
A case management model of care was implemented in a 30-bed high level residential aged care facility in rural Victoria, in response to anecdotal reports of growing staff dissatisfaction with the perceived ineffective, task-focused model of care that had evolved.
5) Shark meat also typically contains high levels of methylmercury, and anecdotal reports suggest fins may be treated with formaldehyde before they are sold.
These anecdotal reports are closely watched by market participants because they will be used by Fed policymakers at their next meeting July 31-Aug.