May 12, 2022 Technical SEO , content SEO , page rank , SEO measures , external measures
What is page rank (Page Rank = PR)?
Meaning of page rank
I will explain the meaning of the page rank. First, let's take a look at Wikipedia.
Wikipedia
Pagerank is an algorithm for determining the importance of the web page, and is a central technology used in Google for search engines to obtain the appropriate results for search words. The name comes from the "page" of the web page and one of the founders of Google, Rally Page.
Wikipedia
It's a bit difficult, so in a nutshell, it's like a notification table from Google for each site. Remember the notification table of school days.
I think that the notification table appeared in each item, such as "language", "mathematics", "science", and "Japanese history", and the total number appeared at the bottom. That is exactly the page rank. Evaluate from 0 to 10, 10 is the highest rank, and 0 is the lowest rank.
Page rank standards
Here, let's take a look at what kind of site the page rank is.
Page Rank 10
White House, Google, US government
Page Rank 9
Cabinet Office, UN Headquarters
Page Rank 8
Yahoo! JAPAN
You can see that it is quite expensive if it is PR8 with Yahoo! JAPAN.
In addition, there are N/A other than 0 in the page rank.
This indicates that there is no page rank until the page rank is updated when a new site is launched.
How the page rank is decided
Then, how to decide the page rank is how many quality sites are linked to the target site.
In addition, it is not always good to be careful here that the amount of links is large.
Based on that premise, Google considers links as a support form, so it is judged that links from good sites = backlink sites are good sites.
Strictly speaking, there is an equation that determines the page rank.
PR (a) = (1-d) + D (PR (T1)/C (T1) +… + PR (TN)/C (TN))
PR (A): Page rank calculation Site
PR (T1) -PR (TN): Page rank C (T1) -C (TN) linked to page A
: Included in the link source TN page Total number of links to other web pages
The page rank is calculated by complicated calculation, which is somewhat difficult. And Google has a patent for this calculation method.
That's why there are recently that "page rank is a meaningless indicator", but it is not an indicator that can be neglected.
Update page rank
The page rank has the opportunity to be updated about once every three months. (Although it has not
, so it is not easy to keep the page rank. (Postscript)
Google suggests that there is no plan to update the page rank in the future.
However, this non -updated page rank is displayed on the toolbar of Chrome. This is a page rank for the pretend, and the above formula pages ranked in the search engine algorithm should still be moving and continuing to move.
I heard recently that "Page rank is meaningless", but as one of the important indicators of algorithm, we value the page rank. However, as I will talk about, the page rank is not everything.
Page ranks are not all required for top display
A site with a high page rank is not necessarily the top. It is only one of the 200 Google algorithms.
It's important to get a link from a good site, but it's not all.
It can be said that it is a good SEO measure only for both internal and external measures.
In addition, the difference in page rank is not equal. For example, the difference between page rank 1 and 2 is not the same as page rank 3 and 4. It is said that it is about 20 times different. In other words, it is 20 multiplication.
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