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 2014, 2013 and 2012, divided by the sum of the total insurable earnings for the years 2014, 2013 and 2012 for salaried employees of that given category, prior to adjustments for employee premium refunds.

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