Application of the Bayesian framework for forensic interpretation to casework involving postmortem interval estimates of decomposed human remains
Journal article, 2019

© 2019 Elsevier B.V. We demonstrate how the Bayesian framework for forensic interpretation can be adapted for casework involving postmortem intervals (PMI) utilizing taphonomic data as well as how to overcome some of the limitations of current approaches for estimating and communicating uncertainty. A model is implemented for indoor cases based on partial body scores from three different anatomical regions as correlated functions of accumulated temperature (AT). The multivariate model enables estimation of PMI for human remains also when one or two local body scores are missing or undetermined, e.g. as a result of burns, scars or covered body parts. The model was trained using the expectation maximization algorithm, enabling us to account for uncertainty of PMI and/or ambient temperature in the training data. Alternative approaches reporting the results are presented, including the likelihood curve, likelihood ratios for competing hypotheses and posterior probability distributions and credibility intervals for PMI. The applicability or the approaches in different forensic scenarios is discussed.

Bayesian

Forensic taphonomy

Postmortem interval

Forensic statistics

Value of evidence

Author

M.G. Andersson

Swedish National Veterinary Institute

Ann Sofie Ceciliason

Akademiska Sjukhuset

Linköping University

Håkan Sandler

Akademiska Sjukhuset

Linköping University

Petter Mostad

Chalmers, Mathematical Sciences, Applied Mathematics and Statistics

Forensic Science International

0379-0738 (ISSN)

Vol. 301 402-414

Subject Categories

Bioinformatics (Computational Biology)

Oceanography, Hydrology, Water Resources

Probability Theory and Statistics

DOI

10.1016/j.forsciint.2019.05.050

More information

Latest update

9/13/2019