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Tajima's D is a population genetic test statistic created by and named after the Japanese researcher Fumio Tajima. [1] Tajima's D is computed as the difference between two measures of genetic diversity: the mean number of pairwise differences and the number of segregating sites, each scaled so that they are expected to be the same in a neutrally evolving population of constant size.
Comparing the value of the Watterson's estimator, to nucleotide diversity is the basis of Tajima's D which allows inference of the evolutionary regime of a given locus. See also [ edit ]
These included the mean and the variance of the time between the present and the most recent common ancestor. In his paper, Tajima showed that well-known results of "classical" population genetics could be reproduced by using coalescence theory. While doing so, Tajima was likely unaware of the previous work of John Kingman in the same area. [5]
a.d. auris dextra: right ear a single-storey a can be mistaken as an o which could read "o.d.", meaning right eye ad., add. adde addatur: add let there be added ad lib. ad libitum: Latin, "at one's pleasure"; as much as one desires; freely compare pro re nata, "as needed", which by convention includes an aspect of "up to some maximum".
Nabi Tajima (田島 ナビ, 1900–2018), Japanese supercentenarian; Naoto Tajima (田島 直人, 1912–1990), Japanese athlete; Nobuhiro Tajima (田嶋 伸博, born 1950), Japanese race car driver; Princess Tajima (但馬皇女, died 708), daughter of Emperor Tenmu of Japan; Renee Tajima-Peña (born 1958), American film director and producer
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Tajima's D is based on the expectation that S = theta * x where x is the sum of 1/i for i from 1 to N. Thus, we turn this into a method to estimate theta by noting that theta = E(S)/x. The current version suggests that S/x part is a "normalized" version of segregating sites, and this leads to a mistake in the calculation of D in the example.
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