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Wednesday, 29 September 2010

CAD grid square analysis of violence and robbery in London

These two maps use the same data as my other maps at Ward level but this time I have calculated the number incidents in a grid square that is 250 metres by 250 metres. This is the maximum accuracy of the Metropolitan Police Service Computer Aided Dispatch system which records these incidents. There are 26116 such squares in Greater London. This compares to 624 Wards

This is where scale comes into the analysis. Will analysis which is using units on average which are 42 times smaller and have a totally equal size (except those that clip the London Boundary) make a difference to the correlation and predictability between robbery and violence against person incidents?

The graph above shows the answer. There is a predictability of almost 0.6 and a correlation of 0.77. These are high figures.

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