Methodologies used in RSDI construction

RSDI is the sum of many dimensions where each dimension is a sum of indicators. There will be as balanced and important indicators within each dimension as available of data as possible. Both indicators and dimensions will give a broad picture of road safety and not focus on one particular aspect. 

Most composite indices follow the linear functional form. (Frederik, 2002) reported that the additive regression means that we can measure apples and oranges individually and then aggregate them into one index. The typical (standard) composite index of RSDI will take the form  

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