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Foundations of Casualty Actuarial Science

B = Ballast Value
w = Excess Losses Weighting Factor

Note , the denominator of this formula equals E + B

Where
    E = Excess Losses

This formula is also written as

A +C + (A X w )
M= p  e

Ep +C + (Ee X w)

Where C is a different stabilizing value than B. C is a
function of w, B and Ee.

    M =1 + CD

         Where CD is the experience rating (credit/debit)

16. Determine the experience modification
         M = AP + B + (Ae X w) + [ (1 - w) X Ee ]
               Ep + B + (Ee X w) + [ (1-w) X Ee]

         Where
              M = Experience Modification Factor
              Ap = Actual Primary Loss

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