Some of you have asked about the actual formula.  Here it is!

The experience rating modification formula:

• Is used to determine the experience rating modification for all risks eligible for experience rating. • Includes the data of all states in a risk’s experience period to produce an experience rating modification.

	Primary Losses		Stabilizing Value				Ratable Excess		Totals
	Actual Primary Losses	+	(1 minus Weighting Value) x Expected Excess Losses	+	Ballast Value	+	Weighting Value x Actual Excess Losses	=	Total A
	Expected Primary Losses	+	(1 minus Weighting Value) x Expected Excess Losses	+	Ballast Value	+	Weighting Value x Expected Excess Losses	=	Total B

For the experience rating modification, divide Total A by Total B, then round to two decimal places.