Patent ID: 8121795

Claim:
A computer implemented method of comparing a test sample result set with another sample result set, the method including: obtaining a test sample and analysing the test sample to provide a test sample result; providing information for the test sample result set on the one or more identities detected for a variable characteristic of DNA; providing information for the another sample result set on the one or more identities detected for a variable characteristic of DNA, the another sample result having been obtained from another test sample by analysis; establishing a likelihood ratio for one hypothesis relative to an alternative hypothesis, wherein the likelihood ratio is defined as: LR = Pr ⁡ ( C ❘ S , H p ) ∑ i ⁢ ⁢ Pr ⁡ ( C ❘ U i , S , H d ) ⁢ Pr ⁡ ( U i ❘ S , H d ) where: C is the test result set from a test sample, S is the another sample result set, H p is one hypothesis, H d is an alternative hypothesis, U i is one of the supposed sources stated in H d ; wherein the likelihood ratio is conditioned on quantity of DNA in the test sample and/or another sample result set; wherein the likelihood ratio is displayed to the user by the computer; and wherein the method provides evidence as to the likelihood ratio of one hypothesis to another hypothesis, the one hypothesis being that advanced by the prosecution in the legal proceedings and the another hypothesis being that advanced by the defence in the legal proceedings.