Y-STR Kinship-Index Calculation

Calculate the likelihood ratio of patrilineal relationship versus non-relationship of male pairs given their Y-STR profiles. The calculation takes

  • The profile of the ancestor ("upstream" male relative)
  • The profile of the offspring ("downstream" male relative)
  • The number of transmission events (often referred to as 'meiosis' or 'generation') between the male relatives

Please see Buckleton JS., Triggs CM., Walsh SJ. (2005), Forensic DNA evidence interpretation, 1st ed., CRC press and Rolf B., Keil W., Brinkmann B., Roewer L., Fimmers R. (2001), 'Paternity testing using Y-STR haplotypes: assigning a probability for paternity in cases of mutations.', Int J Legal Med 115(1), 12-5 [Pubmed] for further details on the fundamental theory used here and our documentation on the actual implementation at YHRD.

Limitation of this method

  • Only one-step events are considered. E.g. it is impossible to explain a three-step difference with two transmission events.
  • The relation between exactly two persons (ancestor and offspring) is calculated

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If you don't know how to export your samples using Applied Biosystems® GeneMapper® ID/ID-X please read our instructions.

If you don't know how to set up an Excel-, OpenOffice- or CSV-spreadsheet for Kinship-Index calculation, please see our example or read our instructions.

In either case, please consider checking your file before you are going to use it here.

* See FAQ/Glossary (http://yhrd.org/pages/faq) for further explanations of abbreviated terms used here