. "Appendix F: Simulating False Match Probabilities Based on Normal Theory." Forensic Analysis Weighing Bullet Lead Evidence . Washington, DC: The National Academies Press, 2004.
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Forensic Analysis Weighing Bullet Lead Evidence
pairs) rather than values themselves. The table below consists of 49 entries, corresponding to all possible pairs of the seven elements. The value 1.000 on the diagonal confirms a correlation of 1.000 for an element with itself. The values in the cells on either side of the diagonal are the same because the correlation between, say, As and Sb is the same as that between Sb and As. For these off-diagonal cells, the first line reflects the conventional Pearson correlation coefficient based on the 1,373-bullet subset from the 1,837-bullet subset (bullets with all seven measured elements or with six measured and one imputed for Cd). The second line is Spearman’s rank correlation coefficient on rank(data), again for
Line 1:
conventional correlations on log(data),
1,373-bullet subset
Line 2:
Spearman correlations on rank(data),
1,373-bullet subset
Line 3:
Spearman correlations on rank(data),
1,837-bullet subset
Line 4:
Number of pairs in Spearman correlation,
1,837-bullet subset
(Note: 1.000 on the diagonal is indicated on line 1 only)
