Leitgeb and Pettigrew on Accuracy and Updating

Ben Levinstein (Rutgers) gives a talk at the 9th Formal Epistemology Workshop (Munich, May 29–June 2, 2012) titled "Leitgeb and Pettigrew on Accuracy and Updating". Abstract: Leitgeb and Pettigrew (2010) argue that (1) agents should minimize the expected inaccuracy of their beliefs, and (2) inaccuracy should be measured via the Brier score. They show that in certain diachronic cases, these claims require an alternative to Jeffrey-Conditionalization. I claim that this alternative is an irrational updating procedure and that the Brier score, and quadratic scoring rules generally, should be rejected as legitimate measures of inaccuracy.