Anecdotal evidence is evidence based only on personal observation, collected in a casual or non-systematic manner.
"Anecdotal" can refer to:
1. Relaying personal experiences[1] or sense data,[2] also called testimony, or a testimonial.[3]
2. Relaying the words or experiences of another[4] named person,[5] sometimes called hearsay.[6]
3. Relaying an account from an fictional source, or story[7] with no attribution, also called an apocryphal[8] saying, an Old Wives' Tale, a Myth, or folklore.
Because the term connotes three very different kinds of evidence, discussion of the term can result in accidental or intentional equivocation , where people are talking about different meanings of the term without realizing it. Since an anecdote may be real or fictional,[9] it is often difficult to talk about this form of evidence as a category without explaining exactly what type of anecdotal evidence is being referenced.
Anecdotal Evidence usually is not subject to rules of legal, historical, academic, or intellectual rigor, meaning that there are little or no safeguards against fabrication or inaccuracy. This does not mean that all anecdotal evidence is false, it just means that the methodology of scholarly method or the scientific method, or legal requirements of testimony have not been required of the evidence.
When used in advertising or promotion of a product, service, or idea, anecdotal reports are often called a testimonial, which are highly regulated[10] in some jurisdictions.
Anecdotal evidence may be considered within the scope of scientific method as some anecdotal evidence can be both empirical and verifiable, e.g. in the use of case studies in medicine. Other anecdotal evidence, however, does not qualify as scientific evidence, because its nature prevents it from being investigated by the scientific method, for instance, in that of folklore or in the case of intentionally fictional anecdotes. Where only one or a few anecdotes are presented, there is a chance that they may be unreliable due to cherry-picked or otherwise non-representative samples of typical cases.[11][12] Similarly, psychologists have found that due to cognitive bias people are more likely to remember notable or unusual examples rather than typical examples.[13] Thus, even when accurate, anecdotal evidence is not necessarily representative of a typical experience. Accurate determination of whether an anecdote is typical requires statistical evidence.[14] Misuse of anecdotal evidence in the form of argument from anecdote is an informal fallacy[15] and is sometimes referred to as the "person who" fallacy ("I know a person who..."; "I know of a case where..." etc.) which places undue weight on experiences of close peers which may not be typical.
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