@inproceedings{8718a2c8b83642dd842a8294b1d26e61,
title = "A fused forensic text comparison system using lexical features, word and character N-grams: A likelihood ratio-based analysis in Predatory Chatlog messages",
abstract = "This study investigates the degree that the performance of a likelihood ratio (LR)-based forensic text comparison (FTC) system improves by using logistic-regression fusion on LRs that were separately estimated by three different procedures, involving lexical features, word-based N-grams and character-based N-grams. This study uses predatory chatlog messages. The number of words used for modelling each group of messages is 500 words. The performance of the FTC system is assessed in terms of its validity (= accuracy) and reliability (= precision) using the log-likelihood-ratio cost (Cllr) and 95% credible intervals (CI), respectively. It is demonstrated that 1) out of the three procedures, the lexical features procedure performed best in terms of Cllr; and that 2) the fused system outperformed all three of the single procedures. The Cllr value of the fused system is better than that of the procedure with lexical features by a value of 0.14. It is also reported that the validity and reliability of a system is negatively correlated; the fused system that yielded the best result in terms of Cllr has the worst CI value.",
keywords = "95% credible intervals, N-grams, Tippett plot, forensic text comparison, lexical features, likelihood ratio, log likelihood ratio cost, logistic-regression fusion",
author = "Shunichi Ishihara",
note = "Publisher Copyright: {\textcopyright} 2014 IEEE.; 3rd International Conference on Advances in Computing, Communications and Informatics, ICACCI 2014 ; Conference date: 24-09-2014 Through 27-09-2014",
year = "2014",
month = nov,
day = "26",
doi = "10.1109/ICACCI.2014.6968504",
language = "English",
series = "Proceedings of the 2014 International Conference on Advances in Computing, Communications and Informatics, ICACCI 2014",
publisher = "Institute of Electrical and Electronics Engineers Inc.",
pages = "2762--2768",
editor = "Comer, {Douglas E.} and Peter Mueller and Bhawna Mallick and Sougata Mukherjea and Thampi, {Sabu M.} and Dilip Krishnaswamy and Axel Sikora",
booktitle = "Proceedings of the 2014 International Conference on Advances in Computing, Communications and Informatics, ICACCI 2014",
address = "United States",
}