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Welcome to the 2011 edition of the Search Engine Ranking Factors. For the past 6 years, SEOmoz has compiled the aggregated opinions of dozens of the world's best and brightest search marketers into this biennial, ranking factors document. This year, for the first time, we're presenting a second form of data - correlation-based analysis - alongside the opinions of our 132-person panel.
[The correlation-based analysis] shows SEOmoz's analysis of 10,271 keyword search results from Google.com (US). The numbers shown are mean Spearman's correlation with higher rankings, meaning that a higher number indicates that websites + pages with the given feature (or more of the given feature, as in cases like "# of links") tended to rank higher on average than those without. Remember - correlation is not causation! Just because pages/sites with a given feature tend to rank higher doesn't necessarily mean that this particular feature is the cause of that higher ranking.
For domains expiring within the year, the crawl and index rate dramatically drops off.
"For domains expiring within the year, the crawl and index rate dramatically drops off."
Anyone else share that view?
PS. Thanks for the correlation example although I'm still not sure how useful it is in this context.
Through all this analysis of search optimization - we will always conclude that a site needs "more links, more quality links, more content, and higher quality content"