What is PageRank?

**PageRank **** is a numeric value that represents how important a page is on the web. Google figures that when one page links to another page, it is effectively casting a vote for the other page. The more votes that are cast for a page, the more important the page must be. Also, the importance of the page that is casting the vote determines how important the vote itself is. Google calculates a page's importance from the votes cast for it. How important each vote is is taken into account when a page's ****PageRank ** is calculated.

**PageRank ** is Google's way of deciding a page's importance. It matters because it is one of the factors that determines a page's ranking in the search results. It isn't the only factor that Google uses to rank pages, but it is an important one.

From here on in, we'll occasionally refer to **PageRank ** as **"PR". **

Notes:

Not all links are counted by Google. For instance, they filter out links from known link farms. Some links can cause a site to be penalized by Google. They rightly figure that webmasters cannot control which sites link to their sites, but they can control which sites they link out to. For this reason, links into a site cannot harm the site, but links from a site can be harmful if they link to penalized sites. So be careful which sites you link to. If a site has PR0, it is usually a penalty, and it would be unwise to link to it.

How is PageRank calculated?

To calculate the **PageRank ** for a page, all of its inbound links are taken into account. These are links from within the site and links from outside the site.

PR(A) = (1-d) + d(PR(t1)/C(t1) + ... + PR(tn)/C(tn))

That's the equation that calculates a page's **PageRank. ** It's the original one that was published when **PageRank ** was being developed, and it is probable that Google uses a variation of it but they aren't telling us what it is. It doesn't matter though, as this equation is good enough.

In the equation 't1 - tn' are pages linking to page A, 'C' is the number of outbound links that a page has and 'd' is a damping factor, usually set to 0.85.

We can think of it in a simpler way:-

a page's **PageRank ** = 0.15 + 0.85 * (a "share" of the **PageRank ** of every page that links to it)

"share" = the linking page's **PageRank ** divided by the number of outbound links on the page.

A page "votes" an amount of **PageRank ** onto each page that it links to. The amount of **PageRank ** that it has to vote with is a little less than its own **PageRank ** value (its own value * 0.85). This value is shared equally between all the pages that it links to.

From this, we could conclude that a link from a page with PR4 and 5 outbound links is worth more than a link from a page with PR8 and 100 outbound links. The **PageRank ** of a page that links to yours is important but the number of links on that page is also important. The more links there are on a page, the less **PageRank ** value your page will receive from it.

If the **PageRank ** value differences between PR1, PR2,.....PR10 were equal then that conclusion would hold up, but many people believe that the values between PR1 and PR10 (the maximum) are set on a logarithmic scale, and there is very good reason for believing it. Nobody outside Google knows for sure one way or the other, but the chances are high that the scale is logarithmic, or similar. If so, it means that it takes a lot more additional **PageRank ** for a page to move up to the next **PageRank ** level that it did to move up from the previous **PageRank ** level. The result is that it reverses the previous conclusion, so that a link from a PR8 page that has lots of outbound links is worth more than a link from a PR4 page that has only a few outbound links.

Whichever scale Google uses, we can be sure of one thing. A link from another site increases our site's **PageRank. ** Just remember to avoid links from link farms.

Note that when a page votes its **PageRank ** value to other pages, its own **PageRank ** is not reduced by the value that it is voting. The page doing the voting doesn't give away its PageRank and end up with nothing. It isn't a transfer of PageRank. It is simply a vote according to the page's **PageRank ** value. It's like a shareholders meeting where each shareholder votes according to the number of shares held, but the shares themselves aren't given away. Even so, pages do lose some **PageRank ** indirectly, as we'll see later.

Ok so far? Good. Now we'll look at how the calculations are actually done.

For a page's calculation, its existing **PageRank ** (if it has any) is abandoned completely and a fresh calculation is done where the page relies solely on the **PageRank ** "voted" for it by its current inbound links, which may have changed since the last time the page's **PageRank** was calculated.

The equation shows clearly how a page's **PageRank ** is arrived at. But what isn't immediately obvious is that it can't work if the calculation is done just once. Suppose we have 2 pages, A and B, which link to each other, and neither have any other links of any kind. This is what happens:-

Step 1: Calculate page A's **PageRank ** from the value of its inbound links

Page A now has a new **PageRank ** value. The calculation used the value of the inbound link from page B. But page B has an inbound link (from page A) and its new **PageRank ** value hasn't been worked out yet, so page A's new **PageRank ** value is based on inaccurate data and can't be accurate.

Step 2: Calculate page B's **PageRank ** from the value of its inbound links

Page B now has a new **PageRank ** value, but it can't be accurate because the calculation used the new **PageRank ** value of the inbound link from page A, which is inaccurate.

It's a Catch 22 situation. We can't work out A's **PageRank ** until we know B's **PageRank, ** and we can't work out B's **PageRank ** until we know A's PageRank.

Now that both pages have newly calculated **PageRank ** values, can't we just run the calculations again to arrive at accurate values? No. We can run the calculations again using the new values and the results will be more accurate, but we will always be using inaccurate values for the calculations, so the results will always be inaccurate.

The problem is overcome by repeating the calculations many times. Each time produces slightly more accurate values. In fact, total accuracy can never be achieved because the calculations are always based on inaccurate values. 40 to 50 iterations are sufficient to reach a point where any further iterations wouldn't produce enough of a change to the values to matter. This is precisely what Google does at each update, and it's the reason why the updates take so long.

One thing to bear in mind is that the results we get from the calculations are proportions. The figures must then be set against a scale (known only to Google) to arrive at each page's actual **PageRank. ** Even so, we can use the calculations to channel the **PageRank ** within a site around its pages so that certain pages receive a higher proportion of it than others.

NOTE:

You may come across explanations of **PageRank ** where the same equation is stated but the result of each iteration of the calculation is added to the page's existing **PageRank. ** The new value (result + existing **PageRank) ** is then used when sharing **PageRank ** with other pages. These explanations are wrong for the following reasons:-

1. They quote the same, published equation - but then change it

from PR(A) = (1-d) + d(......) to PR(A) = PR(A) + (1-d) + d(......)

It isn't correct, and it isn't necessary.

2. We will be looking at how to organize links so that certain pages end up with a larger proportion of the PageRank than others. Adding to the page's existing **PageRank ** through the iterations produces different proportions than when the equation is used as published. Since the addition is not a part of the published equation, the results are wrong and the proportioning isn't accurate.

According to the published equation, the page being calculated starts from scratch at each iteration. It relies solely on its inbound links. The 'add to the existing **PageRank' ** idea doesn't do that, so its results are necessarily wrong.

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