Paternity Index

The paternity index is a method of calculating the strength of a particular match. This is based partly on the relative uniqueness of the match. For example, the alleged father and the child display an allele value of ‘12’ at marker D2S1338. Here, the paternity index value is 1.845. According to measurements, this is a very strong match. But if the allele value was a more common match, the PI would be much smaller. It would be around .0782. That this matches the two participants, means that one is really the child’s biological father, or it could be so as most people would match with this allele value at this particular location. If it was a known fact the allele value would be ‘12’ at this specific location, the match would become stronger, as it is rarer. In such a case, the PI value could increase and become 3.452, 12.819 or 34.125. This depends on the match’s strength. If the father and the child do not match, then the PI value would be 0.000.

Information on Paternity Index
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