TY  - JOUR
PY  - 2014//
TI  - Progress toward the determination of correct classification rates in fire debris analysis ii: Utilizing soft independent modeling of class analogy (SIMCA)
JO  - Journal of forensic sciences
A1  - Waddell, Erin E.
A1  - Williams, Mary R.
A1  - Sigman, Michael E.
SP  - 927
EP  - 935
VL  - 59
IS  - 4
N2  - A multistep classification scheme was used to detect and classify ignitable liquid residues in fire debris into the classes defined by the ASTM E1618-10 standard method. The total ion spectra (TIS) of the samples were classified by soft independent modeling of class analogy (SIMCA) with cross-validation and tested on fire debris. For detection of ignitable liquid residue, the true-positive rate was 94.2% for cross-validation and 79.1% for fire debris, with false-positive rates of 5.1% and 8.9%, respectively. Evaluation of SIMCA classifications for fire debris relative to a reviewer's examination led to an increase in the true-positive rate to 95.1%; however, the false-positive rate also increased to 15.0%. The correct classification rates for assigning ignitable liquid residues into ASTM E1618-10 classes were generally in the range of 80-90%, with the exception of gasoline samples, which were incorrectly classified as aromatic solvents following evaporative weathering in fire debris.<p />  <p>Language: en</p>
LA  - en
SN  - 0022-1198
UR  - http://dx.doi.org/10.1111/1556-4029.12417
ID  - ref1
ER  -