[(laspeyer+paarche)/2]*100
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The severity index formula is used to calculate the relative seriousness of vehicle crashes at a given location. It takes into account the number of crashes as well as the severity of the injuries sustained by those involved.
disadvantages of index numbers
merits and demerits of index number
here is the formula modulation index=peak freq deviation/operating freq. frm this we can calculate freq dev
becaused it is exact