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SUMMARY:A Bayesian network for glass evidence evaluation at activity level
 : a novel approach to model the background distribution - Peter Vergeer (N
 etherlands Forensic Institute)
DTSTART:20160926T151500Z
DTEND:20160926T160000Z
UID:TALK67585@talks.cam.ac.uk
CONTACT:INI IT
DESCRIPTION:<span>In burglary cases the comparison of glass particles foun
 d on a piece of clothing of a suspect and a broken reference glass pane is
  of importance. Often\, suspects are known as multiple offenders and may h
 ave a large collection of glass on their clothing. Therefore\, in order to
  evaluate the strength of evidence\, current likelihood ratio formulas con
 tain parameters such as the number of groups of glass found on a piece of 
 clothing\, and the size of the matching group [1]. In order to obtain prob
 abilities for these parameters\, glass particles found on clothing of susp
 ects have been counted and grouped\, see e.g. [2]. In general\, the amount
  of glass particles found on a suspect is limited in these studies. <br></
 span>  <span><br>A database of glass from suspects in the Netherlands show
 s quite deviant results. Up to a few hundred of glass particles are often 
 encountered and only samples may be analyzed. In order to evaluate the evi
 dential strength of a sample of particles with a background model based on
  samples from casework requires a different background model. We propose t
 o model the background distribution of the sample by a &lsquo\;Chinese res
 taurant process&rsquo\; [3]. </span>  &nbsp\;  <br><span><br>[1]&nbsp\;For
 ensic Interpretation of Glass Evidence\, CRC Press. (2000). <a target="_bl
 ank" rel="nofollow" href="https://www.crcpress.com/Forensic-Interpretation
 -of-Glass-Evidence/Curran-Hicks-Champod-Buckleton/9780849300691">https://w
 ww.crcpress.com/Forensic-Interpretation-of-Glass-Evidence/Curran-Hicks-Cha
 mpod-Buckleton/97...</a> (accessed April 19\, 2016).</span>  <br>[2]&nbsp\
 ;J.A. Lambert\, M.J. Satterthwaite\, P.H. Harrison\, A survey of glass fra
 gments recovered from clothing of persons suspected of involvement in crim
 e\, Sci. Justice. 35 (1995) 273&ndash\;281. doi:10.1016/S1355-0306(95)7268
 1-8.  <br><span>[3]&nbsp\;D.J. Aldous\, Exchangeability and related topics
 \, in: P.L. Hennequin (Ed.)\, &Eacute\;c. D&Eacute\;t&eacute\; Probab. St.
 -Flour XIII &mdash\; 1983\, Springer Berlin Heidelberg\, 1985: pp. 1&ndash
 \;198. <a target="_blank" rel="nofollow" href="http://link.springer.com/ch
 apter/10.1007/BFb0099421">http://link.springer.com/chapter/10.1007/BFb0099
 421</a> (accessed September 2\, 2016).</span>
LOCATION:Seminar Room 1\, Newton Institute
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