(902)9-1-1 Map Data: Median total response time by police atom, 2006-2010

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What's on this map?

This map shows how long it typically takes police to respond to a selection of call types. Policing in Halifax region is provided by the Halifax Regional Police Service and the RCMP. This map shows calls to the Halifax police. The Halifax force mainly polices the urban core and rural areas on the eastern Chebucto Peninsula. These area are divided into three districts, central on the Peninsula, east in Dartmouth and west from Sambro north to Bedford. Those districts are further divided into zones, and the zones are further divided into sub zones called atoms. Click on any atom to see the median time, and the shortest and longest responses on record, for that atom. Urgent calls for crimes in progress have much faster response times and the colours here represent three-minute increments. For calls that typically take longer, 10-minute increments are used. As this is a standard Google map, you can zoom in and out and switch between the default road map and satellite view.

Data analysis and map by Schenley Brown, Patrick Odell, King's Investigative Workshop.
Important notes to assist in intpretation:
This map shows the median total response time, the time it takes from the time a call comes in until police arrive on scene, for a range of call types.
The median is the value that falls half way along a range of values. If there are 101 values, the median is the 50th. Half of the values will be equal to or greater than the median, half will be equal to or smaller.
Median is used here because it is a better measure of how long it typically takes police to arrive than a straight average, which would be disproportionately affected by a small number of very long times.
The call type shown here is that assigned when the call is dispatched.
Maximum response time is that indicated by Halifax police calls data as analyzed and usually represents an extreme value. It is presented for context.
All datasets contain errors. The maximum response time value is more likely to be in error than the minimum. Use caution when interpreting the maximum response time. The median is a better measure of overall performance.
Calls for which no officers were dispatched, or for which the response time was 0 (already on the scene) are not included in the calculations. All calls, however, are included in the count.