域名级关键词的使用所表现出的这些特征，包括了如何在根域名或子域名中使用关键词，以及其在搜索引擎排名上可能具有的影响力。
注： 在过去这些年中我们已经看到了，不管是由一组投票得出的有关其重要性的结果，还是相关的数据，都呈现出明显的下降趋势。在2010年6月，精确匹配的.com域的相关性指数为0.38，排名也更高，而在2011年3月下旬，这个数字下降到了0.22，这是整个数据集的最大跌幅之一。

域名级关键词的使用 - 相关数据

域名级关键词的使用 - 调查数据

域名级关键词使用的相关评论

• Joe Rozsa 精确匹配域名仍然是功效非常强大的。当然，你不会只为了获得一个关键词而想去使用一个无用（和超过实际需要）的域名。子域就可以，子域名是根域下不同的地址，所以不一定都要通过根域名授权。
• Ben Pfeiffer .com、.net和.org的精确匹配是相当强有力的因素。在我看来，混合域没有带来任何特别的利益，包含关键词的子域似乎也在影响力上有略微下降。
• Micah Fisher-Kirshner 当ICANN将顶级域名扩展到许多领域时，看谷歌针对延展域名实行折扣会有多迅速，将会是有趣的。这场将要结束的争夺战将会在以相同域名作为主题域的使用标准（不同的电影名字都将用.movie来记忆）和如SanFrancisco.hotels这样更加SEO化的策略之间展开。虽然这些域名的高额售价将是一个大障碍，但可能性大而不容忽视。
• Paul Martin 这对谷歌来说是一个棘手的争夺战。虽然我了解品牌排名因素在建立一个网站上有着极端重要的价值，并帮助消除精确匹配的锚文本垃圾邮件，通过一个算法破译一个品牌和关键字是什么，这是一个艰巨的任务。有没有可能呢？我希望如此，但如果没有，他们需要以某种方式解决有着巨大影响的精确匹配域名的问题。

这些特征描述了关于托管网页的根域名的链接指标（如对于页面www.test.com/A，这些特征为指向*. test.com的链接，而不仅仅是网页A）。
注意： 下列链接带（百分比）的负相关性表明，nofollowed链接很少的网站可能表现不佳。我们不确定这是为什么，但链接配置文件的“自然状态”可归咎部分原因。（自然合理的网站都有nofollowed和followed链接，而一些垃圾邮件/机械式操作只有followed链接）。

域名级链接权威特征 - 相关数据

域名级链接权威特征 - 调查数据

域名级链接权威特征的相关评论

• Brian McDowell 感到惊讶的是顶级域名并没有在今年的名单上。虽然我不是一个关注于.edu或者.gov链接的爱好者，但在我看来，这是国际性链接建设的不变焦点（.ca/.uk/.hk...）。
• Todd Malicoat 通过所有这些搜索优化分析—我们将推断出一个网站需要更多的链接，更优质链接，更多内容，以及更高质量的内容。

这些特征涉及到整个根域，但不直接描述链接或以关键词为基础的因素。相反，它们涉及到域名字符长度、网站错误页面的数量、网站内容的相对独特性等。
注：相关数据无法显示全部特征，但其包含的三个都是负相关（意味着，域名所包含的字符越多，一般预示着排名会越差）。

域名级关键词不确定性特征 - 相关数据

域名级关键词不确定性特征 - 调查数据

域名级关键词不确定性特征 - 非链接相关

域名级关键词不确定性特征的相关评论

• Angie Schottmuller 域名注册的长度作为一个要素仍然存在。我已经看到它在搜索引擎优化的影响因素中凸显出来。由于域名在年内到期，抓取和索引率会大大下降。
• Marshall Simmonds 独特的内容是20世纪90年代的原始营销工具，现在再次回到了这个原点。虽然许多人从来没有将视线从别人拥有的客观因素上离开，并迷失在那些时尚的提升策略中，但强大独特的内容仍然关键。
• AJ Kohn 我可能无法将独特性作为整个网站的首要因素，直到Farmer/Panda更新，但它显然是目前唯一最重要的因素。此外，速度和错误也提供了强有力的潜在用户满意度的信号。
• Peter Meyers 域名长度是个棘手的问题。在其他条件相同的情况下，用来符合你的关键字的最短域名是最无力的，但我不认为绝对长度是的一个必然因素。如果你的目标关键词是4个字，那么更长可能会更好。
• Carlos del Rio 许多关键词模糊查询因素不能给予正值，反而给出的是负值。看来，一个加载速度慢的网站会伤害你的潜在排名，但超过一定阙值的“快速”也不能帮到你。

这些特征描述了所显示品牌的品质和品牌指标对根域名的影响。
注意：不幸的是，这些特征在这一轮相关数据中没有直接可观的，所以这里目前只有投票者的意见。

域名级品牌指标

域名级品牌指标的相关评论

• Thomas Schmitz 我质疑这当中的有些排名因素。如果你有很多你品牌的搜索量，或你可能从别处得到很多链接和涉及内容的大量维基百科引文，这确实起了大作用。
• Richard Baxter 我认为最重要的候选排名因素必须是原始搜索量结合高CTRs（点击率），在这个域名级品牌度量排行里面才会有作用-导航查询和品牌查询在大多数情况下是一样的。
• Dave Davies 在未来的12到24个月里面，这些因素将有大幅波动。影响新闻网站的因素将会发生显著的变化，在于这篇报道是PRWeb新闻稿还是一篇来自其他门户网站的“真正”的新闻。
• David Harry 这些因素都是不权威且难懂的。举例来说Google Place重要的是在于它页面本身，然而对于其他新闻网站引用的内容来说，重要的却是google上面的新闻。进一步来讲，搜索量能够涉及到网站的所有元素正如Google Suggest，所以最终的“重要性”就很见仁见智了。
• Scott Polk 对我来说LinkedIn和Google Places不能被评价那么高，因为这不是一个真正被全世界认可的排名因素。
• Fabio Ricotta 为了识别重要的品牌，谷歌必须把注意力集中在用户在查找中提供的信息上面。如果用户搜索一个特定的品牌很多次，为什么不考虑将其作为一个有影响力的品牌呢？这自然是应该去思考和编码的。其次，一个品牌在一个新闻网站被提到多少次是接下来需要去掌握的数据。
• David Iwanow 问题是任何人都能建立一个社交的轮廓。如果他是一个被验证了的推特帐号，他就有较高的排名。
• Kurt Krejny 新闻和社交网站提到的品牌/域名的次数在未来一两年里应该更有影响力，其产品或服务出现频率高的品牌将继续从中得益。
• Angie Schottmuller 在大多数情况下，域名级品牌指标对SEO的影响很小。我从来没见过影响SEO的社会账户的存在。其价值在于，出版和链接共享，而不是实际存在的官方网页。

这些特征涉及影响页面排名的社会媒体第三方指标（脸谱，Twitter等）
NOTE: The high correlations here were extremely surprising and interesting. We've written more about these in this blog post: Facebook + Twitter's Influence on Google's Rankings.

页面级社会化指标 - 相关数据

页面级社会化指标 - 调查数据

页面级社会指标的相关评论

• Todd Malicoat 这些因素在当查询应该具备新鲜度时而可能更加有影响力，但是仍然没有意义重大到在此文档编写完成之时影响页面的整体排名。+1可能是对这个的改变，覆写的变量胜过谷歌搜索页面级的社会指标。
• Dave Davies 这些因素将在未来12至24个月内发生改变，谷歌将在决定搜索引擎优化使用的社交媒体上面变得更加富有经验。
• Chris Boggs 这些都是针对纳入到“相关网站/品牌”建议非常重要的因素。在案例中我们看到，它花费了大概4个月时间在积极的社交媒体buzz上，为了最终为特定行业得到具有历史意义的“大玩家”。
• Jon Payne 我没有在这里看到LinkedIn，但我已经看到一些有关个性化结果和自己LinkedIn网络的趣事，所以我相信它也应被视为可能与Twitter和Facebook一样的社交媒体。
• Scott Polk 尽管我知道谷歌注视着它，这种用法相比于其他社会新闻分享网站是相当低的，因此会集中于那些在buzz之前的。
• John Shehata 推特仍然是最强的社交平台，它是完全开放的，谷歌已经直接进入到fire-hose ，同时用户权限相比于其它网站会更容易计算。
• Jordan Kasteler 情感分析现在对谷歌来说十分困难而无法控制。社交用户的权限当前来说也很难测量。以我的观点，现在应以数量取胜，但是对权限和情感的要求将会在不久的将来得到多数认可。
• Shaun Anderson 我认为推特是谷歌开展社交业务的基准，他们也有机会获得推特的数据同时加以计算。此刻虽然我不是关于社会‘权威’的爱好者，但考虑到其在排名中的影响—我期待谷歌一直能够在这方面做得更好。
• Tim Grice 这是排名一个非常新而有趣的方面，我们最近进行的一些测试表明大多数推特用户不在乎自己的权限，而这对搜索引擎结果页面产生重大的影响，即使在最有竞争力的时候也是如此。这些链接似乎还持有一些长期的价值。

注：在过去的几年，网页特定链接特征是相关指标排名最高的（虽然社会因素现在也起到一定作用）。我们发现非常有趣的是，在一般情况下，部分匹配锚文本比精确匹配锚文本关联性更好。

页面级链接指标 - 相关数据

页面级链接指标 - 调查数据

页面级链接指标的相关评论

• Abhilash Patel Recently we have observed that excessive "quantity" of keyword-using inbound links can create algorithmic filters, which influences same keyword rankings negatively, dramatically and quickly. This raises the element's importance, because the lesson should be as cautionary as it is encouraging. It is a shame that pure, raw statistics like "quantity of links that employ the keyword as part of the anchor text" is still as influential as we observe. Elements like "distance of the page from a trusted seed..." should be more influential for sake of accuracy, but we have not observed that yet.
• Richard Baxter Topical relevance is incredibly weak in comparison to raw inbound link diversity (root domain links) and anchor text optimization. That point amazes me but most SERPs still show evidence of this tactic working well.
• David Harry Most certainly we've seen changes over the years as far as mass numbers. Unique domains and contextual links work far better than they used to and site-wide links have seen dampening. Another area not really touched on is location IMO. Search engines are getting much better at page segmentation and it's certainly something worth considering in the years ahead.
• Patrick C. Price The Unique-C-Block importance seems to have decreased since broader adoption of cloud hosting services like Amazon / Google / Azure has taken place. Unique URLs seem to have more influence, than unique C-Class blocks.
• Ross Hudgens I'm not convinced a site-wide link even has 2x the value of a link on the strongest page of a domain. In general, I would be careful with sitewide links with commercial anchor text in general, because instances of this occurring naturally almost never happen on a non-SEO-influenced link graph.
• Paul Martin This is a hard question to answer in a general way, as different circumstances affect different websites - hence why a link audit, before any campaign starts, is so crucial. For example; a website that has years and years of amazing brand based links can benefit hugely from establishing just one or 2 exact keyword links. However a website with much less brand presence will no doubt suffer from building exact keyword links and so a much more wide spread and creative approach is needed.
• Russ Jones I think "anchor text pass-through" should be considered. Essentially, Google may use a more simplistic model than topic relevance of your linking pages and, instead, could simply give additional weight to links that share the same anchor text (ie: imagine tracing the mozRank of the keyword "viagra" via anchor text links across the web, and using that as a separate measurement. Almost like a keyword-specific PR).
• Greg Niland George Orwell would probably say "All links are equal but some links are more equal than others".
• Wiep Knol I'd say that the quantity of unique linking root domains that contain a link employing the keyword as the exact anchor text is the most important factor, as long as you have a large amount of naturally looking links to back it up. If not, you'll eventually trigger a filter of some kind.

这些特征描述了页面上HTML代码中特定部分（Title元素，H1，ALT属性等）使用关键词术语/短语对页面排名的影响情况。
注： TF-IDF（term frequency–inverse document frequency）是一种用于信息搜索和信息挖掘的常用加权技术。在搜索、文献分类和其他相关领域有广泛的应用。
TF-IDF的主要思想是，如果某个词或短语在一篇文章中出现的频率TF高，并且在其他文章中很少出现，则认为此词或者短语具有很好的类别区分能力，适合用来分类。TF词频(Term Frequency)指的是某一个给定的词语在该文件中出现的次数。IDF反文档频率(Inverse Document Frequency)的主要思想是：如果包含词条的文档越少，IDF越大，则说明词条具有很好的类别区分能力。
使用TF*IDF可以计算某个关键字在某篇文章里面的重要性，因而识别这篇文章的主要含义，实现计算机读懂文章的功能。

页面级关键词的使用 - 相关数据

页面级关键词的使用 - 调查数据

页面级关键词的使用的相关评论

• Hamlet Batista The keyword in the first few words of a meta description doesn't help with ranking, but Google is more likely to to use the meta description as the search snippet when the keyword is part of the search query.
• Dave Davies Some factors included here such as keywords as the first word of title and description tag are affected by the click through rates that this results in. While they may be factors unto themselves - their position in this ranking set is affected by their influence on click through rates.
• Lindsay Wassell Seeking absolute or ideal keyword occurrences or densities (percent-based) for any on-page factor is pretty old-school. The algorithm is more complicated than these simple gaming tactics give credit.
• Gustavo Bacchin Description tags might not have a direct impact on your rankings however having a unique, keyword-rich, well-written Description tag will help users figure out what your site is about and decide whether or not to click through.
• Kurt Krejny Topic modeling (keyword themes) supported by internal-pointing links with similar anchor text appears to be a stronger factor than it was in the past. Stronger theme building and solid information architecture is crucial to ranking in competitive verticals.
• Pete Wailes I think these loosely fall in to two categories - factors of high importance, and those of low importance. Things such as keywords in title tags, link-metric based factors etc I'd call important, whereas factors such as keyword usage in meta descriptions, or keyword density I'd say were more archaic and of less use.
• Dan Cohen Some of them aren't ranking factors in my experience, merely best practices to be used in particular circumstances.
• Hugo Guzman I think that in many cases, several of these so-called factors have little to no impact. In other words, a site that doesn't have things like header tags can still secure the No. 1 spot easily.
• Greg Niland Webmasters need to remember that page elements can serve multiple uses. For example having the keyword present in the url string is not as important for the Google algorithm as it is to the user looking at the Google SERP. Showing the keyword in the url on the SERP can dramatically boost CTR.

这些元素描述了关于排名页面的用户+使用的数据（如Google + Bing，搜索工具栏、浏览器和移动设备，而获得了大量的网络流量数据）。
注： 不幸的是，这一轮相关数据不是直接明显得出的，所以目前只能参考投票者的观点。

页级流量/查询数据

页级流量/查询数据的相关评论

• Lauren Vaccarello If you look at this from Google's perspective, bounce rate indicates a quality issue and a poor user experience. It's in Google's best interest to deliver the best possible results to prevent a competitor from gaining market share.
• Carlos del Rio I think that most of the traffic related factors are highly gameable and probably only a minor factor in total.
• Ian Lurie I suspect Google's been using behavioral data for a long time. They're very cagey about this question, saying things like "We don't use CTR to determine rankings". OK, but they don't mention using CTR to detect spam, adjust existing rankings, etc..
• David Lindop This is such an unknown area, it's impossible to claim any level of authority when theorizing. If I had to step off the fence however, I'd say that immediate bounces back to the search results page feels like a strong signal that the page didn't satisfy the user's requirement.
• Tim Grice It's still difficult to understand how user behavior affects rankings, however CTR seems to be a straight forward yet weak signal for Google to measure the relevance of a listing.

这些元素描述了非关键词的使用，非个人网页链接的数据特征（如页面的长度，加载速度等）。
注： 响应时间，从某种程度来说，响应时间的长短与排名的高低是负相关的（所以往往加载页面的速度越快，排名越高）。同样令人欣慰的是，AdSense的数量和尺寸的大小都与高排名负相关，表明谷歌不会在排名中偏向于他们自己的广告产品。

页面级别关键字不确定性特征 - 相关数据

页面级别关键字不确定性特征 - 调查数据

页面级别关键字不确定性特征的相关评论

• Hamlet Batista Microformats don't help with ranking, but when used to provide rich snippets they can increase organic CTR.
• AJ Kohn I feel the need, the need for speed. Speed coupled with unique content is a winning combination.
• Matthew Brown Factors like load speed, http response time, and use of advertising are not important until they reach a certain threshold. Example: Use of advertising does not influence rankings until you reach a certain ad to content ratio, then you may be hit with the Panda factor.
• Everett Sizemore I would have ranked "Diversity of content types (i.e. text, video, image, micro-data...) on the page" as very high, but each content type on it's own isn't as strong of an indicator from my experience when dealing with the "core" algorithm (i.e. non-blended, non-local, non-personalized...).
• Joe Rozsa Unique, relevant content is still king. Sites and pages can still be ranked well despite poor HTML, poor navigation and poor site architecture. It makes it difficult, but with an existing sitemap.xml file, these things are not deal breakers. Site load time has not had a major impact on SERPs in my opinion, unless the site has an absurdly long load time where the overall user experience is poor.
• Scott Smith Freshness is a widely misunderstood issue. Pages that have not been updated in years can rank in top 3 spots. Freshness can be a positive indicator, and matters on some kinds of sites and in some verticals more than others. But site owners shouldn't make a practice of updating quality pages for the sake of freshness, if the pages don't need it.