Equation for EC ratio (x)

The experience cost ratio for a given category of wage-loss plan (1 to 4) is equal to the sum of the experience cost of that category for the years 2013, 2012 and 2011, divided by the sum of the total insurable earnings for the years 2013, 2012 and 2011 for salaried employees of that given category, prior to adjustments for employee premium refunds.

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