Motor Vehicle Accident Fatalities for the Week Ending, January 11, 2008

Record of the Fatalities for Motor Vehicle Accidents in Iowa per week.

Motor Vehicle Accident Fatalities for the Week Ending, January 18, 2008

Record of the Fatalities for Motor Vehicle Accidents in Iowa per week.

Motor Vehicle Accident Fatalities for the Week Ending, January 25, 2008

Record of the Fatalities for Motor Vehicle Accidents in Iowa per week.

Motor Vehicle Accident Fatalities for the Week Ending, February 1, 2008

Record of the Fatalities for Motor Vehicle Accidents in Iowa per week.

Motor Vehicle Accident Fatalities for the Week Ending, February 8, 2008

Record of the Fatalities for Motor Vehicle Accidents in Iowa per week.

Motor Vehicle Accident Fatalities for the Week Ending, February 15, 2008

Record of the Fatalities for Motor Vehicle Accidents in Iowa per week.

Motor Vehicle Accident Fatalities for the Week Ending, February 22, 2008

Record of the Fatalities for Motor Vehicle Accidents in Iowa per week.

Enforcement problems and secondary markets

There is a large and growing literature that studies the effects of weak enforcement institutions on economic performance. This literature has focused almost exclusively on primary markets, in which assets are issued and traded to improve the allocation of investment and consumption. The general conclusion is that weak enforcement institutions impair the workings of these markets, giving rise to various inefficiencies.But weak enforcement institutions also create incentives to develop secondary markets, in which the assets issued in primary markets are retraded. This paper shows that trading in secondary markets counteracts the effects of weak enforcement institutions and, in the absence of further frictions, restores efficiency.

Motor Vehicle Accident Fatalities for the Week Ending, February 29, 2008

Record of the Fatalities for Motor Vehicle Accidents in Iowa per week.

On certain greedoid polyhedra, partially indexable scheduling problems and extended restless bandit allocation indices

We present a polyhedral framework for establishing general structural properties on optimal solutions of stochastic scheduling problems, where multiple job classes vie for service resources: the existence of an optimal priority policy in a given family, characterized by a greedoid(whose feasible class subsets may receive higher priority), where optimal priorities are determined by class-ranking indices, under restricted linear performance objectives (partial indexability). This framework extends that of Bertsimas and Niño-Mora (1996), which explained the optimality of priority-index policies under all linear objectives (general indexability). We show that, if performance measures satisfy partial conservation laws (with respect to the greedoid), which extend previous generalized conservation laws, then theproblem admits a strong LP relaxation over a so-called extended greedoid polytope, which has strong structural and algorithmic properties. We present an adaptive-greedy algorithm (which extends Klimov's) taking as input the linear objective coefficients, which (1) determines whether the optimal LP solution is achievable by a policy in the given family; and (2) if so, computes a set of class-ranking indices that characterize optimal priority policies in the family. In the special case of project scheduling, we show that, under additional conditions, the optimal indices can be computed separately for each project (index decomposition). We further apply the framework to the important restless bandit model (two-action Markov decision chains), obtaining new index policies, that extend Whittle's (1988), and simple sufficient conditions for their validity. These results highlight the power of polyhedral methods (the so-called achievable region approach) in dynamic and stochastic optimization.

Motor Vehicle Accident Fatalities for the Week Ending, March 7, 2008

Record of the Fatalities for Motor Vehicle Accidents in Iowa per week.

Motor Vehicle Crash Fatalities for Week Ending, March 21, 2008

Motor Vehicle Crash Fatalities

Motor Vehicle Crash Fatalities for Week Ending, March 28, 2008

Motor Vehicle Crash Fatalities

Motor Vehicle Crash Fatalities for Week Ending: April 4, 2008

Vehicle fatalities from around the state of Iowa.

Motor Vehicle Crash Fatalities for Week Ending, April 4, 2008

Motor Vehicle Crash Fatalities