...wow...what terrible survey methodology!
The Indicators
Each of the five indicators is a quantitative measure.
The five indicators are:
• Number of homicides per 100,000 people
Source: FBI Uniform Crime Reports, 1991-2009
The USPI uses the same defi nition of homicide as the U.S. Bureau of Justice Statistics, wherein homicide is defined as “murder or non-negligent manslaughter”.
• Number of violent crimes per 100,000 people
Source: FBI Uniform Crime Reports, 1991-2009
The U.S. Peace Index measure uses the Bureau of Justice Statistics definition of violent crime and the associated quantitative measures. In the U.S., the measure of violent crime includes homicide, forcible rape, robbery, and aggravated assault. The USPI measure of violent crime excludes homicide from this group, as it is already included in the first indicator.
• Number of jailed population per 100,000 people
Source: U.S. Bureau of Justice Statistics, 1991-2009
In order to allow for meaningful comparisons across states, the USPI only includes prisoners under state jurisdiction who have been sentenced to more than one year in prison. This means that both federal prisoners and prisoners in jail are excluded from this indicator.
• Number of police officers per 100,000 people
Source: FBI Uniform Crime Reports, 1991-2009
This number includes both sworn officers and civilian
employees. The USPI uses the census population estimates for all states and indicators for the sake of consistency.
• Availability of small arms
Source: Centers for Disease Control and Prevention,
National Center for Injury Prevention and Control, Fatal
Injury Reports, 1991-2007 Although the U.S. has excellent data for many statistics, there is no reliable data on small arms availability, small arms ownership, or small arms sales within the U.S. or within the states of the U.S. An accurate measure of gun prevalence
cannot be calculated from administrative records alone. For this reason many studies on gun prevalence use a quantitative proxy. The proxy used in the USPI is: firearm suicides as a percentage of total suicides (FS/S). As this indicator varied significantly from year to year for some states, a five year moving average was used in order to smooth out the variance. For example, the figure used for Alabama for 2008 was an average of FS/S for 2003-2007. More detail on why this proxy was chosen is supplied in Appendix B to this report.
All indicators are scored between 1 and 5, with 1 being the most peaceful possible score, and 5 being the least peaceful.
Scores are calculated to two decimal places.
http://www.visionofhumanity.org/wp-content/uploads/2011/04/U.S.-Peace-Index-2011-3.pdf