If you only want to know the results of this analysis, please view "Executive_Summary.pdf".
If you want to see my codes and how I did this analysis, please view "Master.Rmd".
You can find all the datasets, shapefiles and variable guide used in this analysis under "data" folder.
The data I used here is road safety data in UK 2016. There are 3 datasets: Accidents, Vehicle, Casualty. As it's easy to understand, an accident is mostly likely involve more than 1 vehicle, and it's likely to have multiple casualties from different vehicles. So Vehicle and Casualty are linked with Accidents by Accident_Index, Casualty and Vehicle are linked by Vehicle_Reference. You can find out how the variables were coded in Road Accident Safety Data Guide.
I also used UK population data in my analysis.
I got the UK shapefiles from here.