The correlation between different normalisation methods

This may lead us to admit that the chosen sample of countries is rather small and perhaps this analysis will differ if we take a larger sample of countries. This will perhaps lead to the values having more skewed distribution. 

Frederik (2002) has explained the advantages and disadvantages of different weightings methods used in several research studies. The study demonstrated the reasons behind the choice. It concluded that the weighing remarks are always questionable Wo weighting system is above criticism . 

6 Combining the chosen indicators into RSDI by using different techniques 

In principle, four main approaches will be used to calculate RSDI and determine which one is best. The idea as in other indices is to experiment with different approaches and weights and to compare the obtained results afterwards, before deciding on one or more 

The selection of the formula depends on the safety level if it has an increasing or decreasing rate in the change with respect to the value of indicator. 

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Figure 5.2 The correlation between different normalisation methods for a road safely performance...

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