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Math Help - FN Curves and Risk Analysis

  1. #1
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    Aug 2009
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    FN Curves and Risk Analysis

    Hi all

    I am trying to assess the risk for a project and must create an FN curve from a similar (but much larger and more complex) set of data below.

    Using the potential frequency of fatalities (as F) and the equivalent fatalities (as N) I need to make the FN Curve. I think it will be logarythmic but don't know whether it is a stepped graph, line graph, area graph or whatever. I am unsure also whether I simply add up all of the frequencies of the same no of equiv. fatalities or whether I use some sort of complex cumulative frequency (which I am unsure how to use properly in this context).

    I have extensively seached the net but no simple answer is forthcoming.

    Many thanks

    Yogi
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  2. #2
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    F-N curve

    Using the scheme outlined in http://home.att.net/~d.c.hendershot/...s/riskland.pdf, you should add up the frequencies of any outcome for which the equivalent fatalities are greater than or equal to a given value of N. Then plot the frequency sums as the ordinate against N as the abscissa. In the small data set you gave in the attached Excel file, you would get the following:

    N F log F
    0.1 12.31737 1.090517987
    1 12.21406 1.086860049
    10 12.20203 1.086432088

    The third column is the base-10 logs of the frequency sums. I usually see F-N curves with a line connecting the points, but there are many ways one might display the information. The attached Excel file displays an F-N curve based on your data, with the frequency sums expressed in logs.
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