U.S. CitiesCity-Data Forum Index
Go Back   City-Data Forum > Administration Zone > About the Forum
 [Register]
Please register to participate in our discussions with 1.5 million other members - it's free and quick! Some forums can only be seen by registered members. After you create your account, you'll be able to customize options and access all our 15,000 new posts/day with fewer ads.
Jump to a detailed profile or search
site with Google Custom Search

Search Forums  (Advanced)
Business Search - 14 Million verified businesses
Search for:  near: 
Reply Start New Thread
 
Old 06-26-2007, 06:24 PM
 
8,377 posts, read 19,450,592 times
Reputation: 2196
Default How does city-data calculate its crime index?

I was curious as to how city-data calculates its safety index. I wanted to calculate the index of crimes in my entire county CD style, rather than on city level. I found a website that gave me all of the information. Thank you very much .
Reply With Quote Quick reply to this message

 
Old 06-26-2007, 09:12 PM
 
Location: Blue Ridge Mtns of NC
5,658 posts, read 17,376,149 times
Reputation: 3489
They probably get the county level crime data from the FBI's annual Uniform Crime Reporting (UCR) Program. The final 2006 FBI report hasn't been issued.

Florida Counties - Table 10 (Florida) - Crime in the United States 2005 (http://www.fbi.gov/ucr/05cius/data/table_10_fl.html - broken link)
Reply With Quote Quick reply to this message
 
Old 06-26-2007, 09:16 PM
 
8,377 posts, read 19,450,592 times
Reputation: 2196
Quote:
Originally Posted by mm34b View Post
They probably get the county level crime data from the FBI's annual Uniform Crime Reporting (UCR) Program. The final 2006 FBI report hasn't been issued.

Florida Counties - Table 10 (Florida) - Crime in the United States 2005 (http://www.fbi.gov/ucr/05cius/data/table_10_fl.html - broken link)
Florida has issued thier stats

Statistics compiled by the FDLE for crimes in Florida -- OrlandoSentinel.com

I am just trying to figure out if thier crimes per 100,000 index is similar to that of City-Data. If it is, my city took a HUGE jump this year! I want to calculate my own index CD style, but I am struggling to find out how they do it, I have tried all sorts of calculations. If i knew what crimes per 100,000 was relevant to the national average, I could just rely on that, but its pretty difficult without benchmarking it to anything.

Also, that link is just revealing data about county police offices. Although BSO (my area) may have only handled three murders, most cities have an independent police department, so obiously my county of 1.8 million had more than that!
Reply With Quote Quick reply to this message
 
Old 06-26-2007, 09:21 PM
 
Location: Blue Ridge Mtns of NC
5,658 posts, read 17,376,149 times
Reputation: 3489
Here's the home page for the UCR Program.

Federal Bureau of Investigation - Uniform Crime Reports
Reply With Quote Quick reply to this message
 
Old 06-26-2007, 09:24 PM
 
8,377 posts, read 19,450,592 times
Reputation: 2196
I apperciate the link, but I am still curious as to how CD calculates its index to get the number that they have.
Reply With Quote Quick reply to this message
 
Old 06-28-2007, 01:47 AM
 
122 posts, read 257,711 times
Reputation: 56
You take the number of murders, multiply by 4, add arson multiplied by the square root of thefts, use a random number generator to get a value from 1-100 and add that to burglaries.

Then, you add all those numbers together. Take the population of the city, and divide by that number.

* If it's more than 300, you put it in the "high crime" category, and use a random number generator to add anywhere from 1-100 to it. If it's less than 40 miles from a town of between 2000-3000 people you add the last two digits of that town's population. You add the number of rapes per 100,000 people, and a number you fancy that's less than 200. Add the number of movie stars in the area times the current day of the month. Then you subtract the number of adult novelty shops, drug dealers, and prostitutes in the city from the total. If the final number is less than 1000, or the city is D.C. that's your crime index. If it's more than 1000, you subtract the number of Elvis sightings in the county in the last 40 years from the total.

* If the number was less than 300, you throw three darts at a dart board and multiply your score by 2. Whichever number is bigger is the crime index. If both numbers are zero, add 40 to the number of weeks it is until your birthday to get the index.

Hope that helps!
Reply With Quote Quick reply to this message
 
Old 07-03-2007, 02:40 PM
 
8,377 posts, read 19,450,592 times
Reputation: 2196
I hate to be lazy but...

2006 Florida County-by-County Crime Data -- OrlandoSentinel.com

Can Broward be calculated?Orange? Palm Beach? Miami-Dade? Heh.
Reply With Quote Quick reply to this message
 
Old 07-09-2007, 11:24 AM
 
8,377 posts, read 19,450,592 times
Reputation: 2196
Quote:
Originally Posted by fort lauderdale View Post
I hate to be lazy but...

2006 Florida County-by-County Crime Data -- OrlandoSentinel.com

Can Broward be calculated?Orange? Palm Beach? Miami-Dade? Heh.
Wah wah wah, I guess nobody passed algerbra!!!!
Reply With Quote Quick reply to this message
 
Old 12-24-2009, 07:20 AM
 
Location: Lancaster, TX
1,196 posts, read 1,951,105 times
Reputation: 1360
I see the Crime Index Scores have been updated to include 2008 statistics based on the latest FBI Uniform Crime Report. When calculating the final index score, are any types of crime weighted more that others in the tally? My reason for asking is that some of the new figures for cities in my area (Dallas-Fort Worth) show places with higher per capita property and violent crime rates are receiving lower "better" scores than places with lower per capita rates.

Here's one example:

Garland (pop. 219,135)
2008 Violent Crimes: 773 (352.8 crimes per 100,000 population)
2008 Property Crime Rate: 9,241 (4217.0 crimes per 100,000 population)
2008 Total Crimes: 10,014 (4569.8 crimes per 100,000 population)
2008 City-Data Crime Index Score: 328.8

Mesquite (pop. 132,600)
2008 Violent Crimes: 492 (371.0 crimes per 100,000 population)
2008 Property Crime Rate: 6,126 (4619.9 crimes per 100,000 population)
2008 Total Crimes: 6,618 (4991.0 crimes per 100,000 population)
2008 City-Data Crime Index Score: 324.8

There are other examples in my area as well. Any explanation or insight would be greatly appreciated.

Thanks!
Reply With Quote Quick reply to this message
 
Old 12-24-2009, 11:41 AM
 
Location: Illinois
3,051 posts, read 1,532,937 times
Not all violent and property crimes are given equal weight. For example, a murder is given more weight than an assault.
Reply With Quote Quick reply to this message
Please register to post and access all features of our very popular forum. It is free and quick. Over $68,000 in prizes has already been given out to active posters on our forum. Additional giveaways are planned.

Detailed information about all U.S. cities, counties, and zip codes on our site: City-data.com.


Reply
Please update this thread with any new information or opinions. This open thread is still read by thousands of people, so we encourage all additional points of view.

Quick Reply
Message:


Over $79,000 in prizes was already given out to active posters on our forum and additional giveaways are planned!

Go Back   City-Data Forum > Administration Zone > About the Forum
Similar Threads

All times are GMT -6.

2005-2014, Advameg, Inc.

City-Data.com - Archive 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25 - Top