8. A system for determining media value of an entity of interest comprising: a computing system having one or more computers, the computing system being configured to calculate a media value based on a frequency of instances of the entity included in one or more computer documents, wherein calculating the media value is based on sentiment associated with instances of the entity included in one or more computer documents and wherein calculating the media value comprises: determining a weighted value attributed to the entity; determining a total number of references to the entity in the one or more computer documents; multiplying the weighted value attributed to the entity by the total number of references to the entity in the one or more computer documents to generate a weighted entity reference value, determining a weighted value attributed to a negative polarity for the instances of the entity in the one or more documents; determining a total number of references to the entity having a negative sentiment polarity; and multiplying the weighted value attributed to the negative polarity by the total number of references to the entity having the negative sentiment polarity to generate a negative entity reference value.
10. The system of claim 8 , wherein calculating the media value further comprises: determining an exposure number representing a number of people to which the one or more computer documents are distributed; determining an economic value per person attributed to exposure of the one or more computer documents; and multiplying the exposure number by the economic value to generate a media value multiplier.