crime concentration index

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The Process • First, develop a layer of just the north patrol districts • Also, create layer of just commercial robberies in the north patrol districts • Using spatial joins, create a layer with robbery counts (total and commercial) • Calculate the CCI for commercial robberies compared to all robberies
The Concentration Index CCI (Comm. Robberies in Dist. (Sum Comm. Robberies All Robberies in Dist.) Sum All Robberies) • The CCI developes the ratio of commercial robberies in a patrol district to all the robberies in that district… • …and then compares that ratio to the ratio of all commercial robberies to all robberies in all the north patrol districts
Page 1 and 2:
Using Crime Concentration Indices i
Page 3 and 4:
The map is not the territory. -Alfr
Page 5 and 6:
Our Fair City
Page 7: ± 0 1 2 4 Miles
Page 10 and 11: Crime Count Example LAX Inglewood-L
Page 12 and 13: Display as Graduated Colors ± Homi
Page 14 and 15: Selection: 184 Tracts Area in Sq Mi
Page 16 and 17: Illustration Dark & Bram, 2007
Page 18 and 19: Crime rates standardize crime count
Page 20 and 21: Crime rate Crime Rates Count of cri
Page 22 and 23: In ArcGIS, create a new Field • S
Page 25 and 26: Using the Field Calculator • This
Page 27 and 28: This is the LAX Tank Farm & support
Page 29 and 30: The Location Quotient • Location
Page 31 and 32: Unemployment Example LQ UE 12 local
Page 33 and 34: Crime Concentration Index • Both
Page 35 and 36: The original reference Brantingham,
Page 37 and 38: Robbery in Roanoke: Concentration b
Page 40: Use a spatial join to create a Coun
Page 44 and 45: Populate the new field…
Page 46 and 47: Add a new field for the CCI • We
Page 48 and 49: The Formula: CCI Robbery C C BG BG
Page 50 and 51: The Sorted CCIs
Page 52 and 53: Interpretation • The two highest
Page 54 and 55: ± 0 1 2 4 Miles Robbery Concentrat
Page 56 and 57: The Problem • The Commander of th
Page 60 and 61: The Field Calculator
Page 62: 1.663018 1.465418 1.297896 0.519309
Page 65 and 66: Neighborhood Organizations • Like
Page 67 and 68: Generating the Neighborhood CCI •
Page 69 and 70: The CCI Formula CCI ( Robbery AreaS
Page 71 and 72: The Results Only 10 out of the 41 a
Page 73 and 74: Drilling down for a micro-spatial a
Page 75 and 76: Getting started • Using the “Go
Page 77 and 78: Finish it up • Do a spatial join
Page 79 and 80: An application to a linear analysis
Page 81 and 82: PALM MELROSE FOREST PARK OLIVE LAFA
Page 83 and 84: The Results CCI (Robberies close to
Page 85 and 86: The Results • But, to be realisti
Page 87 and 88: The Alternative • Using a 755-foo
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crime concentration index

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