23. The computer readable medium of claim 21 , wherein the instructions further comprise instructions to: estimate, using the mathematical model, an estimated synergy score.
21. The computer readable medium of claim 17 , wherein the instructions further comprise instructions to: generate a mathematical model for determining an estimated synergy score based on the first synergy score and data selected from the group consisting of data representing one or more additional synergy score associated with the paid portion of the search advertising campaign, data representing one or more synergy scores associated with one or more other paid portions of other search advertising campaigns, data representing one or more ranking of one or more websites in one or more organic listings at one or more search engines during one or more periods of time, data representing one or more ranking of the website in one or more paid search listings at one or more search engines during one or more periods of time, data representing one or more click-through-rates associated with one or more organic listings of the website at one or more organic listings of the website at one or more search engines, data representing one or more click-through-rates associated with one or more paid search listings of the website at one or more search engines, data representing structure of the website, data representing structure of one or more other websites and data representing a sematic similarity of text associated with one or more organic listings of one or more websites at one or more search engines and text associated with one or more paid search listings of the website at one or more search engine; and store the mathematical model in a machine readable memory.