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The quantitative approach may use a formula to develop numerical values for a hazard.  Examine the actual formula  to make certain that the mathematics actually measure what the users say the formula measures.  In some cases, even in work done by recognized scientific specialists, there are obvious errors in how the mathematical  relationships have been described.  Factors that add to each other should be added, not multiplied.  Factors that multiply the effect of other factors should be multiplied, not added.  In some cases constants are used that are not actually constant through the range of the event or throughout all of the events to which the formula is applied.  In some cases values are mixed together which are not related to each other.  And different impacts may be measured in different ways, or different formulas may be used to generate data that seems to be the same to compare different events.  The following slide provides an example of how some of these factors can be misapplied in an analysis.