Statistical analysis of kerf mark measurements in bone.

Forensic Science, Medicine, and Pathology
James A BaileyR R R Gerretsen

Abstract

Saw marks on bone have been routinely reported in dismemberment cases. When saw blade teeth contact bone and the bone is not completely sawed into two parts, bone fragments are removed forming a channel or kerf. Therefore, kerf width can approximate the thickness of the saw blade. The purpose of this study is to evaluate 100 saw kerf widths in bone produced by ten saw types to determine if a saw can be eliminated based on the kerf width. Five measurements were taken from each of the 100 saw kerfs to establish an average thickness for each kerf mark. Ten cuts were made on 10 sections of bovine bone, five with human-powered saws and five with mechanical-powered saws. The cuts were examined with a stereoscopic microscope utilizing digital camera measuring software. Two statistical cumulative logistic regression models were used to analyze the saw kerf data collected. In order to estimate the prediction error, repeated stratified cross-validation was applied in analyzing the kerf mark data. Based on the two statistical models used, 70-90% of the saws could be eliminated based on kerf width.

References

Oct 6, 2006·International Journal of Legal Medicine·P A SavilleG N Rutty
Nov 18, 2008·Forensic Science International : Synergy·Douglas H Ubelaker
Apr 17, 2009·Journal of Forensic Sciences·Stephanie-Marie Marciniak

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Citations

Aug 9, 2011·Forensic Science, Medicine, and Pathology·Roger W Byard
Dec 29, 2015·Journal of Forensic and Legal Medicine·Davide PortaCristina Cattaneo
Jul 1, 2014·Forensic Science International : Synergy·Caroline CapuaniNorbert Telmon
Oct 11, 2016·Forensic Science International : Synergy·Luísa NogueiraVéronique Alunni
Oct 20, 2018·International Journal of Legal Medicine·A SandrasC Capuani
Feb 14, 2019·International Journal of Legal Medicine·Caroline BernardiGérald Quatrehomme
Sep 16, 2019·International Journal of Legal Medicine·Chiara GiraudoGiovanni Cecchetto
Sep 22, 2020·Journal of Forensic Sciences·Melissa MenschelGary Reinecke
Apr 22, 2020·Journal of Forensic Sciences·Britny Martlin, Carolyn Rando
Jan 23, 2020·International Journal of Legal Medicine·Caroline BernardiGérald Quatrehomme
Oct 21, 2020·Journal of Forensic Sciences·Heather Bonney, Adrian Goodman
Dec 7, 2020·Forensic Science International : Synergy·K AlsopM A Williams
Jan 26, 2021·Sarcoma·Corentin MalherbePierre-Louis Docquier
May 25, 2021·Forensic Science International : Synergy·Caroline BernardiGérald Quatrehomme

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Software Mentioned

R
SAS
Statistical Analysis System ( SAS )

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