SAT Scores:Combined Reading & Mathematics times High School Graduation Rate
U.S. population density data from worldatlas.com. Population density for District of Colombia from Wikipedia.
Percentage of Households with Loaded Household Firearm
The Centers for Disease Control and Prevention (CDC), National Center for Health Statistics, Division of Vital Statistics, National Vital Statistics Report Volume 60, Number 3, December 2011, Table 19. Available at http://www.cdc.gov/nchs/data/nvsr/nvsr60/nvsr60_03.pdf.
The Open PV Project is a community driven database of Photovoltaic (PV) installations. The goal of this project is to collect, organize and distribute knowledge of the location, size, cost and date of every PV installation in United States.
Number of Deaths Due to Injury by Firearms per 100,000 Population. Age-adjusted rates per 100,000 U.S. standard population. Populations used for computing death rates are postcensal estimates based on the 2000 census estimated as of July 1, 2006. Since death rates are affected by the population composition of a given area, age-adjusted death rates should be used for comparisons between areas because they control for differences in population composition. Data are for 2006.
Doctors per 100,000 resident population. Excludes doctors of osteopathy, federally employed persons, and physicians with addresses unknown. Includes all physicians not classified according to activity status.
A trauma center is a hospital that is designated by a state or local authority or is verified by the American College of Surgeons. Hospitals that are solely pediatric trauma centers are not included in this report. A level I trauma center provides the highest level of surgical care to trauma patients. It has a full range of specialists and equipment available 24 hours a day and admits a minimum required annual volume of severely injured patients. A level II trauma center works in...