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For other uses, see Coincidence (disambiguation).
| It is no great wonder if in long process of time, while fortune takes her course hither and thither, numerous coincidences should spontaneously occur. | —Plutarch. Plutarch's Lives: Vol. II. "Sertorius" |
The word is derived from the Latin cum- ("with", "together") and incidere (a composed verb from "in" and "cadere": "to fall on", "to happen"). In science, the term is generally used in a more literal translation, e.g., referring to when two rays of light strike a surface at the same point at the same time. In this usage of coincidence, there is no implication that the alignment of events is surprising, noteworthy or non-causal.
From a statistical perspective, coincidences are inevitable and often less remarkable than they may appear intuitively. An example is the birthday problem, where the probability of two individuals sharing a birthday already exceeds 50% with a group of only 23.[1]
| A "strange coincidence", to use a phrase By which such things are settled nowadays. |
| —Lord Byron. Don Juan. Canto vi. Stanza 78. |
Contents[hide] |
[edit] Computer—simulation of alignments
 |
| 4-point alignments of 269 random points, 4 or more points that align in 607 different straight lines. |
Main article: Alignments of random points
Alignments of random points, as shown by statistics, can be found when a large number of random points are marked on a bounded flat surface. This might be used to show that ley lines exist due to chance alone (as opposed to supernatural or anthropological explanations).Computer simulations show that random points on a plane tend to form alignments similar to those found by ley hunters, also suggesting that ley lines may be generated by chance. This phenomenon occurs regardless of whether the points are generated pseudo-randomly by computer, or from data sets of mundane features such as pizza restaurants. It is easy to find alignments of 4 to 8 points in reasonably small data sets.
[edit] Coincidences vs. caused events
Measuring the probability of any series of coincidences is the most common method of evaluating and determining mere coincidence or connected causality.The mathematically naive person seems to have a more acute awareness than the specialist of the basic paradox of probability theory, over which philosophers have puzzled ever since Pascal initiated that branch of science [1654] (for the purpose of improving the gambling prospects of a philosopher friend, the Chevalier de Méré). The paradox consists, loosely speaking, in the fact that probability theory is able to predict with uncanny precision the overall outcome of processes made up out of a large number of individual happenings, each of which in itself is unpredictable. In other words, we observe a large number of uncertainties producing a certainty, a large number of chance events creating a lawful total outcome.—Arthur Koestler, The Roots of Coincidence[2]
| "... it is only the manipulation of uncertainty that interests us. We are not concerned with the matter that is uncertain. Thus we do not study the mechanism of rain; only whether it will rain." |
| —Dennis Lindley, "The Philosophy of Statistics", The Statistician (2000) |
[edit] Interpretation of coincidence
One of Kammerer's passions was collecting coincidences. He published a book with the title Das Gesetz der Serie (The Law of the Series; never translated into English), in which he recounted 100 or so anecdotes of coincidences that had led him to formulate his theory of Seriality.The Jung-Pauli theory of "synchronicity", conceived by a physicist and a psychologist, both eminent in their fields, represents perhaps the most radical departure from the world-view of mechanistic science in our time. Yet they had a precursor, whose ideas had a considerable influence on Jung: the Austrian biologist Paul Kammerer, a wild genius who committed suicide in 1926, at the age of forty-five.—Arthur Koestler[3]
He postulated that all events are connected by waves of seriality. These unknown forces would cause what we would perceive as just the peaks, or groupings and coincidences. Kammerer was known to, for example, make notes in public parks of what numbers of people were passing by, how many carried umbrellas, etc. Albert Einstein called the idea of Seriality "Interesting, and by no means absurd",[citation needed] while Carl Jung drew upon Kammerer's work in his essay Synchronicity.[4]
Science is the practice of constructing theoretical explanations of how events (phenomena) happen to repeatedly coincide. Remarkable coincidences sometimes lead to theories involving the supernatural or psychic forces. Or the explanation that a person or persons intentionally acted and the coincidence is the evidence of these actions (see conspiracy theories).
Some researchers (e.g. Charles Fort and Carl Jung) have compiled thousands of accounts of coincidences and other supposedly anomalous phenomena (synchronicity). The perception of coincidences often leads to occult or paranormal claims. It may also lead to the belief system of fatalism, that events will happen in the exact manner of a predetermined plan or formula. This lends a certain aura of inevitability to events.
In The Psychology of the Psychic, David Marks describes four distinct meanings of the term "coincidence". Marks suggests that coincidences occur because of "odd matches" when two events A and B are perceived to contain a similarity of some kind. For example, dreaming of a plane crash (event A) would be matched by seeing a news report of a plane crash the next morning (event B).
Deepak Chopra and other proponents of ancient Vedic spiritual and other mystical teachings insist on the view that there is absolutely no coincidence in the world.[citation needed] Everything that occurs can be related to a prior cause or association, no matter how vast or how minute and trivial. All is affected by something related to it that is seen or unseen, cognized or unknowable.
[edit] See also
- Mathematical coincidence
- Delusions of reference
- Chaos theory
- Coincidence theory
- Bible code
- Littlewood's law
- Post hoc ergo propter hoc
- Forteana
- Déjà vu
- Extra-sensory perception
- Randomness
- The Roots of Coincidence
- Synchronicity
- Serendipity
- Coincidence Detection in Neurobiology
- Omen
- Concurrency (road)
- Lincoln-Kennedy coincidences urban legend
[edit] Notes
- ^ Mathis, Frank H. (June 1991). "A Generalized Birthday Problem". Carl Review (Society for Industrial and Applied Mathematics) 33 (2): 265–270. doi:10.1137/1033051. ISSN 0036-1445. JSTOR 2031144. OCLC 37699182.
- ^ Koestler, Arthur (1972). The Roots of Coincidence (hardcover ed.). Random House. p. 25. ISBN 0-394-48038-4 – 1973 Vintage paperback: ISBN 0-394-71934-4
- ^ Koestler, Arthur (1972). The Roots of Coincidence (hardcover ed.). Random House. p. 81. ISBN 0-394-48038-4.
- ^ Koestler, Arthur (1972). The Roots of Coincidence (hardcover ed.). Random House. p. 87. ISBN 0-394-48038-4.
[edit] References
 | This article includes a list of references, but its sources remain unclear because it has insufficient inline citations. (June 2009) |
- Jung, Carl G.: Synchronicity: An Acausal Connecting Principle. Princeton, N.J.: Princeton UP, 1973.
- Arthur Koestler: The Roots of Coincidence
- David Marks: The Psychology of the Psychic (pages 227–246)
[edit] External links
 | Look up coincidence in Wiktionary, the free dictionary. |
 | Wikiquote has a collection of quotations related to: coincidence |
- Collection of Historical Coincidence, nephiliman.com
- Unlikely Events and Coincidence, Austin Society to Oppose Pseudoscience
- The Power of Coincidence, Jill Neimark, Psychology Today
- Why coincidences happen, (Understanding, Uncertainty)
- Is It Just A Coincidence?, examples of global/universal coincidences
- The mathematics of coincidental meetings
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