A new study by Tulane University demographer Mark VanLandingham puts New Orleans' per capita murder rate at 96 per 100-thousxand people last year -- the highest in the nation. There have been various other estimates of the per-capita murder rate, based on various population estimates in the city after Hurricane Katrina. VanLandingham's method takes into account the large change in New Orleans' population over the course of the year. That method takes into account the far lower population of the city in the early months of the year. In his study, VanLandingham used a group of the most widely accepted...