Update to Moz Link Index Comparison Metrics

Here is an update to my post on Moz called “Big, Fast, Strong“. I give the definitions for all these metrics in that post, so I wont repost them here. I started with the only one we aren’t in first place or tied for first place, which is the fastest crawler. That honor still goes to Ahrefs. The rest of the metrics, well, they speak for themselves.   Ahrefs Still has the fastest crawler. Moz and Majestic are neck-and-neck on domain index matches, while Ahrefs is a few % behind. Moz is winning Google URL Index Matches Moz is winning Domain Root Linking Domains Moz is winning URL RLDs Moz is winning backlink counts for domains Moz is winning backlinks to URLs   Moz is in a dead heat with majestic for domain being present in index  ...

In Defense of Domain Authority

With the launch pending for Moz’s much improved Domain Authority metric, the debate has once again been resurrected on whether Google uses Domain Authority and whether it is worthwhile. Let me take a few minutes of your time to unpack this question fully. First, Google has quite unambiguously stated that they do not use Domain Authority in their search algorithms. I take their word on this. Not only do I know Google does not use Moz’s Domain Authority, I do not believe they have a pre-calculated metric that approximates a domain or site authority in general. But what follows from these statements? Does this mean that domain level metrics have no impact on rankings? Does this mean┬áthat DA has no value to search engine optimizers? Let’s address...

Measuring Link Index Freshness

Disclosure: I work for Moz. One of the hardest metrics to compare link indexes on is their percentage of “live links”. At first, it seems like a simple endeavor – just download the backlinks and check if they are live. It turns out that the process is far more complicated for a number of reasons. Redirect chains may not include the target domain in the URL, and there is no way to know which outlink begins the redirect chain without following every outlink on that linking page. Links aren’t always links – does the index count form action as a link? iframe? embed src? Linking sites might be temporarily down (do you count that as a missing link or ignore it). How do you know if it is temporary or permanent? Different indexes have...

Keyword Volume Relational Accuracy

First, quick disclosure: I am Russ Jones, Principal Search Scientist at Moz and I work directly on the model that predicts search volume. It is impossible to know the exact search volume for a keyword in Google. The methodologies available to us (Google Adwords Keyword Planner, Traffic Estimator, and Google Trends) are all problematic in one way or another. But this doesn’t mean we are hopelessly lost regarding our predictions of search volume. One thing we can analyze is the relationship between keywords rather than their exact volume. For example, Google Trends doesn’t provide us the exact search numbers, but it does provide us a comparison of keywords. Theoretically, the relationship between 2 keywords in Google Trends (lets say 3:1 because keyword...

Low Keyword Difficulty Despite Rankbrain

The data side of Search Engine Optimization has become far more confusing and, at the same time, interesting over the last few years thanks in no small part to RankBrain. Let me go ahead and say that anyone interested in learning anything shouldn’t continue reading the rest of this blog post. It is actually part of an experiment which I am currently running and I would appreciate if you wouldn’t just leave the page immediately though. Who knows if big-brother Google is watching and will spoil the experiment because everyone abandoned the article quickly. I also don’t intend to spend much time in this post opining about what I think RankBrain is how it works. Instead, I want to bring up one of the big wrenches that RankBrain throws into a popular...