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Quality Score is a variable used by Google,〔(What is 'Quality Score' and how is it calculated? ) Google AdWords Help, Accessed February 22, 2009〕 Yahoo!〔(Optimize Your Search Campaigns Like A Pro, Using Quality Score ) Yahoo! Advertising Solutions Help, Accessed July 15, 2013〕 (called ''Quality Index''), and Bing 〔(Quality score: What it is and why it matters ) Bing Ads Help, Accessed July 15, 2013〕 that can influence both the rank and cost per click (CPC) of ads. To determine the order in which ads are listed, each ad has the following formula run against it: bid * Quality Score. Ads are then listed in descending order based on the result of that equation. The exact weight of Quality Score versus bid has not been revealed by any of the major search engines, and each company has stated that they reserve the right to continually adjust their ranking methodologies. In late 2008, Google revealed that Quality Score was used to determine which ads it would show above organic results, and that a high quality score could actually cause ads to jump over ads with lower quality scores that would otherwise not merit that prominent placement.〔(Inside AdWords: Improvements to Ads Quality ) Official AdWords Blog, Accessed February 23, 2009〕 ==Purpose behind Quality Score== The major search engines have each independently implemented efforts to maintain and improve the quality of ads listed on their sites. The primary reason for this is to improve the experience of users who click on paid advertising links. It is reasonable to assume that users who have a great experience when clicking on ads will click on them more frequently, thus increasing advertising revenues for the search engine. In addition, Google chose to introduce variable minimum bids at the same time as it introduced Quality-Based Bidding. On the surface, this new feature allowed advertisers to bid as little as $0.01 to have their ad shown. However, in some cases advertisers found their minimum bids for some ads were raised to as high as $5.00 or $10.00. By implementing variable minimum bids Google created a mechanism whereby the company could set different minimums for different advertisers for the same keyword, and potentially increase the average minimum bid without the advertising community as a whole being made aware. Furthermore, by raising minimums bids, Google could test each advertiser's ability to pay these increases, thus increasing competitiveness within the auctions and extracting maximum revenue from each advertiser. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Quality Score」の詳細全文を読む スポンサード リンク
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