1. A computerized method for updating a forecast model comprising: receiving in a computer system an original forecast model, the forecast model including a plurality of inputs; receiving in the computer system a plurality of original input values for the plurality of inputs, wherein the plurality of original input values are of a different unit of measure from one another; converting in the computer system each of the plurality of original input values to a common monetary input value based upon an associated cost to each of the original input values, wherein the common monetary input values are of a same unit of measure; determining in the computer system an original total value based on a sum of the common monetary input values; converting in the computer system each of the plurality of original input values to a normalized percentage value based upon a percentage of the original total value provided by the common monetary input value for each of the plurality of original input values; determining in the computer system a modified total value based on a parameter applied to the original total value; and generating in the computer system modified values for the plurality of inputs based upon applying each of the normalized percentage values to the modified total value.