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What Is the Rank Correlation Coefficient?

What Is the Rank Correlation Coefficient?: The formula for Spearman's rank correlation coefficient involves the differences <I>d<sub>I</sub></I> between two sets of <I>n</I> rankings.

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Charles Edward Spearman, FRS was an English psychologist known for work in statistics, as a pioneer of factor analysis, and for Spearman's rank correlation coefficient.

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Charles Edward Spearman, FRS was an English psychologist known for work in statistics, as a pioneer of factor analysis, and for Spearman's rank correlation coefficient. He also did seminal work on models for human intelligence, including his theory that disparate cognitive test scores reflect a single General intelligence factor and coining the term g factor.

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The clearest way to present the correlations between different factors and Google search results is Spearman's rank correlation coefficient.

Google Makes Social Signals Top Factor for Organic SERP Rank - Presenting the correlations using Spearman’s rank correlation coefficient, this newly released research data was used to determine that Google +1's (0.4) have easily the highest correlation with Google organic SERP Rank. This is closely followed by number of backlinks, Facebook shares, and Facebook total (summary of shares, likes and comments), each at 0.34. The same study published last year, looked at 21 factors...