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vineri, 22 iulie 2011

SEOmoz Daily SEO Blog

Google's Negative Ranking Factors - Whiteboard Friday

Posted: 21 Jul 2011 02:37 PM PDT

By now you've heard about SEOmoz's study of Google ranking factors, but what about negative ranking factors? Sure, positive factors such as the correlations between social media shares and higher rankings earn a lot of attention - and they should. Smart SEOs look at all the factors, including those at the bottom of the list! Today we look at negative ranking factors - those SEO characteristics correlated with lower rankings - and how to avoid them.

Video Transcription

Howdy, SEOmoz! Welcome to another edition of Whiteboard Friday. Today we're going to be talking about negative ranking factors.

Now, we talk about ranking factors a lot here at SEOmoz. Every two years SEOmoz publishes a study called the "Ranking Factors." We just published one about a month and a half ago, two months ago. The positive factors get a lot of publicity. We find things that correlate to higher rankings, and we spend a lot of our time on those.

Some of the more positive famous ranking factors that we talk about are such things as page authority, which has a 0.28 correlation to higher rankings. Now, I know we say this a lot, but I need to give my disclaimer here, that correlation does not equal causation. What this means is that when we see pages with high page authority, they are most likely associated with higher rankings. We look at thousands of search results across the website, we analyze those pages, and we try to find relationships characteristic of those pages and those higher rankings. When we find a relationship, we often say that they are positively correlated. Other elements that have positive correlation would be exact match dot com domains. So if your domain name is, say, Diamonds.com, you have a pretty good chance of ranking for diamonds - for that keyword. Also, linking root domains with partial anchor text is a 0.25 correlation. That just means the broad diversity of domains that link to you with some sort of partial anchor text, there is a pretty high correlation between that measurement and higher rankings. Now, this is what we talk about a lot.

What we don't talk a lot about is the opposite effect, the negative correlation. There are certain factors, there are certain things we find associated with web page that actually are associated with negative rankings. We don't pay a lot of attention to those, but they are actually in there in the ranking factors and they are all the way at the bottom, but they are sort of worth paying attention to, because if we can avoid these, we might be able to learn something about better ranking models and better correlations.

Domain Name Length

Starting with some simple ones, an obvious negative correlation is the domain name length, 0.07. This is kind of an obvious one. If you had a domain, Shoes.com, this tends to rank better in search results than something like Buy-Cheap-Mens-Shoes.com. Now again, correlation does not equal causation. We can think of a lot of reasons for this. For example, Shoes.com, that's probably a much older domain name. It's probably been around for 10 years, has a lot of back links going to it. Buy-Cheap-Mens-Shoes.com kind of looks a little spammy. It is probably not something that is going to earn a lot of links. By the way, if you go ahead and look at these correlation statistics, dashes actually are another negative factor. The more hyphens a domain name has, that is actually another negative correlation factor. That doesn't mean you can't use long domain names. It just means they tend to not do as well from what we observed.

Response Time

Kind of a controversial one here - response time. We love drawing small pictures of animals here on Whiteboard Friday, so here is our tortoise and our hare. 0.05. Now, we don't really know what this is. There is a lot of debate in the SEO world if slower web pages, slower servers cause lower rankings. We don't really have a lot of data on that. We don't really have a definite answer. What we can see from the correlation, this isn't a huge correlation, but we see that these pages tend to rank a little lower than others. We know that faster websites, faster response times present a better user experience. If you have a slow site, it is definitely worth looking into.

AdSense

Now here is a surprising one. There are a lot of people, getting new into SEO, they think that if you use Google services, such as installing Google Analytics on your site or putting AdSense on your site, that Google tends to favor those websites and that you'll rank higher. Correlation data shows exactly the opposite. Google AdSense slots correlated with lower rankings, 0.06. So website A here, if it has all these AdSense, and you've seen these pages - you click on them and they are filled with AdSense - they tend to not rank as well as pages with fewer AdSense slots. Another thing is the number of pixels. So, not only the amount of slots you have, but the pure amount of volume, of space on your website that is taken up by AdSense, we see those associated with lower rankings. Again, doesn't necessarily cause it, but that's what we see. As a user, if you think about it, which page would you rather link to? Both things being equal, I'd much rather link to that page. So it makes sense.

Percent of Followed Linking Pages

The most surprising result of this year's correlation data was the percent of followed linking pages. This requires a little bit of explanation. This means that if all your links pointing towards your domain are followed, we tend to see those sites ranking a little lower. That doesn't seem to make a lot of sense off the get-go. You'd think if all your links were followed, you'd just be great in rankings. But think of domain diversity. Sites that rank well tend to have a lot of sites linking to them. They have sites like Wikipedia that have no followed links, citations no followed links. In general, they have a diverse link profile, whereas spammier sites, smaller sites, newer sites, they are going after those links. They have to work very hard for each one of them, and their diversity is not as great.

These are only a few of the negative ranking factors that you'll find in this year's 2011 SEOmoz Ranking Factors. You can dig into it. We'll link to it in the bottom of this post and Explore Your Own. It's worth looking into all of them. You can learn so much SEO. I love to hear your comments. Thanks everybody. Have a great day.

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