SEO Ranking Factors – Rank Correlation 2013 for Google UK

For UK marketers and SEOs who have been waiting for it, it’s finally here: our Ranking Factors – Rank Correlation 2013 Study for! Fill out the form to download the study:

You may also wish to download our infographic.

As with last year’s study, the Ranking Factor – Rank Correlation 2013 study deals with the definition and evaluation of factors that differentiate better-positioned websites from pages placed further back in the organic search results – i.e.: pages that have a positive rank correlation.

Compared to 2012, we have taken significantly more ranking factors into account in our analysis to finally answer the question: What do web pages that are well-positioned by Google have in common and what distinguishes them from lower ranking pages?

What factors are playing a role?

Ranking Factors Overview UK 2013You can find the most important factors in our overview of all rank correlation coefficients. These are all the factors we have analyzed and consider relevant. We have presented the relationship between Google UK search results and the various factors influencing them using the Spearman correlation – a high positive correlation coefficient occurs for a factor if higher ranking pages have that feature / or more of that feature, while lower ranking pages do not / or have less of that feature. In addition to providing an overview of the changes in correlation since last year, we have extended our analysis in 2013 to include many relevant new factors.

The findings of Google UK analysis are very similar to those results we saw for the US Rank Correlations. While there are some slight differences concerning individual parameters, the general conclusions are the same.

Top highlights of 2013:

  1. Keyword domains and keyword links have lost relevance
  2. Brands are the exception to many rules
  3. Social signals continue to correlate very well with better rankings
  4. Good content is always important: it comes to quality!
  5. The number of backlinks remains immensely important
  6. On-page technology remains one of the basics

Deeper Insights into the study:

  1. Keyword links and keyword domains have lost relevance

    The importance of keywords in the URL / domain has significantly decreased as a ranking factor compared to 2012:

    Ranking Factors Correlation Keywords UK 2013

    In our study, these two factors are considered the losers when compared with last year, because the existence of keywords in the URL and/or the domain have lost their relevance. In the US, the impact of this trend is even stronger. The US correlation for the feature “Keyword in Domain Name” is now only at 0.03. And in the US about 10% more so-called “exact match domains” are gone than in UK (25,8% vs 14,8%).

    This negative trend also affects backlinks when it comes to plain text keyword links. So it looks as if the days of “hard keyword optimization” are over. Google now puts much more emphasis on natural link profiles. Hard keyword links have lost significant influence and can probably – when used excessively – even have a negative effect; for example, when Google updates its algorithm with features devaluing bad links.

  2. Brands are the exception to many rules

    Last year, brands held a privileged position. This has also been confirmed in this year’s study: for brands – and their websites – search engines do not seem to apply the same criteria as for other domains. For example, it seems as though Google considers it natural for brands to have comparatively more backlinks with the name of the brand in the link text alone – what we refer to as “brand links” – and still not be rated negatively.

  3. Social signals continue to correlate very well with better rankings

    Ranking Factors Social Backlinks UK 2013The tendency over the years has been very positive – and this year’s study confirms the trend that became evident as early as 2012: well positioned URLs have a high number of likes, shares, tweets and plus ones and specific URLs stand out in the top search results with a very high mass of social signals. On one hand this means that the activity on social networks continues to increase, on the other hand it means that frequently shared content increasingly correlates with good rankings.

    This trend is even stronger for In the US, we generated even higher correlations for each of the social features on average, Google+ being the highest with 0.40. Even Pinterest seems to be much more important in the US. Moreover, URLs ranking in the US seem to attract many more social signals in absolute numbers on average.

  4. Good content is always important: it comes to quality!

    For our analysis of content features, we have increased the number of factors significantly over the previous year:

    Ranking Factors Chart Content UK 2013

    Ranking Factors Content Backlinks UK 2013Content factors correlate almost entirely positively with good rankings and were apparently – when compared with the previous year – partially upgraded. Good ranking URLs, to a certain extent have more text and a higher number of additional media integrations compared with 2012. A good internal link structure also appears to be an important quality attribute.

    The trend for content features is absolutely positive. In the US, the correlations for most of the features relating to content are even higher than in UK. For example, the average number of internal links for pages ranking on is even higher (UK: 87 vs US: 105).

  5. The number of backlinks remains immensely important

    Ranking Factors  Backlinks UK 2013Backlinks continue to be one of the most important SEO metrics. In this regard, little has changed over the years: sites with more backlinks simply rank better. And this is also the result of our ranking factor study in 2013. In the US, the average number of backlinks is twice as high as the corresponding UK value.

    However, factors around this metric are evolving: not only are the quantity of backlinks important, but increasingly so is their quality! The backlink profile is nowadays regarded as a kind of conglomerate of very diverse quality factors that we discuss in detail in the study. Of special interest here is the correlation for the feature “% Backlinks from same country” which seems to be significantly higher in countries outside the US in general (US: 0.11). Yet, the average SEO Visibility of the link source is nearly ten times higher in the US (28,284).

    Ranking Factors Chart Backlinks UK 2013

  6. On-page technology remains one of the basics

    On-page Technic The on-page factors surrounding the technical side of building web sites have long been one of the basics of a good search engine ranking – and this will continue. Even more, it seems to be fulfilling certain on-page criteria is not about achieving a favorable ranking, rather, it is the opposite: it is simply negative for the rankings when web pages do not meet criteria. On-page factors are therefore considered more of a prerequisite for ranking higher in search results pages.

    Ranking Factors Onpage Chart UK 2013

    Ranking Factors Technical UK 2013On, technical onpage features correlate even higher on average. In the UK, the proportion of domains having keywords in the description is much higher than in the US. Nevertheless, the underlying trends for the features analyzed in the UK and US are – on the whole – similar in both countries.

The context of the Ranking Factors – Rank Correlation Study:

Search engines work with algorithms to evaluate websites by topic and relevance.

On this basis the search engines create a structure for the total of all pages in the search engine index, which finally results in a best possible ranking for users’ search queries. The criteria for the evaluation of websites and the production of this ranking are generally referred to as ranking factors. Please note the difference between correlation and causation in this case. We do not make any statements about causal effects between factors and rankings, but we analyze correlations: and the coexistence of a factor and rankings indicates some kind of relationship. For our study, we have undertaken a comprehensive data collection which enables the analysis of the Ranking Factors for Google UK in 2013 and also allows us to draw comparisons to our analysis of the Ranking Factors in 2012.

This content is an overview of our detailed Ranking Factors – Rank Correlation 2013 study. The results are based on correlation and are not proof of any causal effects.