Interpreting DNA Mixtures Based on the NRC-II Recommendation 4.1: Tables (Forensic Science Communications, October 2000)
October 2000 - Volume 2 - Number 4 |
Interpreting DNA Mixtures Based on the
NRC-II Recommendation 4.1
Table 1
All Possible Genotypes of
Two Unknown Persons and Their Corresponding Probabilities in Computing p2 +cd * abcd ,
Case | Genotypes of 2 unknowns | Probabilities |
---|---|---|
1 | aacd | 4( pa Ú pa )( pc Ú pd ) + 8( pa Ú pc )( pa Ú pd ) |
2 | bbcd | 4( pb Ú pb )( pc Ú pd ) + 8( pb Ú pc )( pb Ú pd ) |
3 | accd | 4( pc Ú pc )( pa Ú pd ) + 8( pa Ú pc )( pc Ú pd ) |
4 | acdd | 4( pd Ú pd )( pa Ú pd ) + 8( pa Ú pd )( pc Ú pd ) |
5 | bccd | 4( pc Ú pc )( pb Ú pd ) + 8( pb Ú pc )( pc Ú pd ) |
6 | bcdd | 4( pd Ú pd )( pb Ú pc ) + 8( pb Ú pd )( pc Ú pd ) |
7 | ccdd | 2( pc Ú pc )( pd Ú pd ) + 4( pc Ú pd )2 |
8 | cccd | 4( pc Ú pc )( pc Ú pd ) |
9 | cddd | 4( pd Ú pd )( pc Ú pd ) |
10 | abcd | 24( pa Ú pb )( pc Ú pd ) |
Table 2
A Rape Case in Hong Kong
Loci | Evidence profile (E) and frequencies (F) | Victim (V) and suspect (S) profiles |
---|---|---|
D3S1358 | E = {14, 15, 17, 18} | V = {15, 18} |
F = {0.033, 0.331, 0.239, 0.056} | S = {14, 17} | |
vWA | E = {16, 18} | V = {18, 18} |
F = {0.155, 0.158} | S = {16, 16} | |
FGA | E = {20, 24, 25} | V = {20, 24} |
F = {0.042, 0.166, 0.106} | S = {25, 25} |
Table 3
Likelihood Ratios for the Case in Hong Kong
With Two Sets of Hypotheses
Hypothesis | q | D3S1358 | vWA | FGA | Combined |
---|---|---|---|---|---|
S1 | 0 | 63.4 | 13.7 | 18.1 | 15,721 |
0.01 | 63.4 | 13.5 | 17.8 | 15,235 | |
0.03 | 63.4 | 13.0 | 17.2 | 14,176 | |
S2 | 0 | 285.4 | 119.0 | 359.2 | 12,175,485 |
0.01 | 285.4 | 114.0 | 349.2 | 11,339,010 | |
0.03 | 285.4 | 104.0 | 331.2 | 9,810,840 |
Table 4
The Likelihood Ratios for the Simpson Case
With a Three-Allele VNTR Mixed Profile
n* | qor 2p | m* | ||
---|---|---|---|---|
0 | 1 | 2 | ||
2 | q = 0 | 1,623 | 70 | 3.06 |
q = 0.01 | 1,554 | 70 | 3.19 | |
q = 0.03 | 1,431 | 70 | 3.46 | |
2p | 158 | 70 | 31.06 | |
3 | q = 0 | 21,606 | 938 | 41.06 |
q = 0.01 | 19,427 | 881 | 40.06 | |
q = 0.03 | 15,914 | 783 | 38.06 | |
2p | 54 | 24 | 11.06 | |
4 | q = 0 | 396,495 | 17,220 | 748.06 |
q = 0.01 | 338,541 | 15,352 | 696.06 | |
q = 0.03 | 251,636 | 12,373 | 609.06 | |
2p | 68 | 30 | 13.06 | |
*The number of unknowns in Hd and Hp are n and m, respectively. |