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How to approximate history of SNP by representative selection tests

I read the article about positive selection. in that article, they approximate the time of the positive selection . in their figure, something wrote like below

 Tajima's D - 250 ky
 |DDAF| - 80 ky
 Fst & XPCLR - 50~70 ky
 |iHS| & XPEHH - 30 ky 
(ky - 1000 years)

How can approximate time of the positive selection by the result of selection tests? I can't understand...

snp
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updated by zx8754 zx8754 • written by vani2lasky99 • vani2lasky99

Hello vani2lasky99,

Please at least provide the article you mentionned,

How could we help you with an explanation of something you did not understand yourself...

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written by Bastien Hervé Bastien Hervé

These measures are all measures of nucleotide frequency. I'm not sure of the meaning of " time of the positive selection". Does it mean the time a SNP was under positive selection, or the time since a SNP was under positive selection. Anyway, you can imagine that when a SNP is under selection, it might change the diversity - this is most obvious with negative selection - you would not expect to see any diversity at SNPs under negative selection as variants would be quickly and efficiently removed.

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written by i.sudbery i.sudbery

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