Method to calculate Google PageRank:

While calculating Google PageRank for a web page, all of its inbound links are taken into account. These are links from within the site (Internal Links) and links from outside the site (External Links). PageRank can be calculated using a simple iterative algorithm. PageRank algorithm is in fact elegantly simple and is calculated as follows:
PR (A) = (1-d) + d (PR (T1)/C (T1) + ... + PR (Tn)/C (Tn))
wher;

• PR (A) is the PageRank of page A,
• PR (Ti) is the PageRank of pages Ti which link to page A,
• C (Ti) is the number of outbound links on page Ti and
• d is a damping factor which can be set between 0 and 1

PageRank helps Google's crawl to give preference to the web page, which has got good PR ranking. In fact, PageRank drives Google's monthly crawl, so that sites with higher PageRank get crawled earlier, faster, and deeper than sites with low PageRank. For a large site with an average-to-low PageRank, this is a major obstacle. If your pages don't get crawled, they won't get indexed. If they don't get indexed in Google, people won't know about them. In short, PageRank is the soul and essence of Google, on both the all-important crawl and the all-important rankings.

www.pagerankings.blogspot.com

eCPM(Effective Cost per Thousand Impressions)- what exactly is that?

eCPM is a bit of industry shorthand that seems here to stay. You've seen it listed in your AdSense reports; it means, "effective cost per thousand impressions."eCPM is calculated by dividing total earnings by total number of impressions in thousands. It is a great performance measure for your various ad units, so when experimenting, you can use eCPM to compare your results.eCPM and CTR (Click Through Rate) is also probably closely watched by AdSense.

On the other hand, it is used to gauge the effectiveness of your ads. If you have optimised your ads properly, have good content and have used keywords effectively which attract high paying ads, you may be high earnings for clicks even though the no of clicks are low, and that will give you a high eCPM. On the other hand, if you have got low paying ads, you may be getting low earnings or even public service ads for which no earnings are given even if you are getting a high no. of impressions, then you will have a low or even zero eCPM.The eCPM is very important for pagerankings.eCPM and CTR (Click Through Rate) is also probably closely watched by AdSense.

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Details :

eCPM can be a useful statistic to track ad performance.For example, let's imagine we have two custom channels named 'Blue Skyscrapers' and 'Red Rectangles', respectively, which reflect the types of ad formats we're testing on our site. During our test, the 'Blue Skyscrapers' channel receives 370 page impressions and $1.48 in total earnings. The 'Red Rectangles' channel receives 187 page impressions and $0.97 in earnings over the same period. To make these figures more comparable we calculate eCPM -- i.e., the estimated earnings for every 1,000 impressions received. We find that eCPM for blue skyscrapers is $4.00 while the eCPM for red rectangles is $5.18.

This means if we received 1,000 impressions of blue skyscrapers, we would earn roughly $4.00. But for 1,000 impressions of red rectangles, we would earn about $5.18. Therefore, assuming that our sample size is large enough, it is to our advantage to switch to red rectangles throughout our site because they generate more revenue per impression.So watch over with your eCPM.

It can be easily calculated.
eCPM = earnings devided by number of impressions multiply by 1000.




Important Topics:

If you are getting very high eCPM, but a very low CTR, your earnings may have been driven up by a lot of invalid clicks from just a few impressions. This may cause AdSense to examine your account closely.
However, a high eCPM with a low CTR may also mean that your site is getting a lot of high paying ads because you have keywords which attract high paying ads, or have optimized the color and the positioning of your ads. So whether Google really pay attention to your eCPM is only guesswork, but for you, it is a good indication of the effectiveness of your ads in your site.

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Excel to find out eCPM :

To make the meaning of eCPM clearer some hypothetica examples are given below. The eCPM was calculated by using the formula eCPM = earnings divided by number of impressions multiply by 1000 (in the C2 cell, typing the formula C2=A2/B2*1000) with MS Excel:Google AdSense eCPM
The figures for eCPM in the last column above was calculated by Excel using the formula =a2/b2*1000 for the second row, and similar calculations were done for the earnigns in the following rows, except that they were given in 2-digit figures.

Another hypothetical example:

Calculation of earnings using figures given for eCPM and Page Impressions
The earnings, in an actual reports may shows $0.00, leading one to think that nothing were earned for the impressions. The figures for the earnings in the above hypothetical example above were calculated using the formula earnings=eCPMxPageImpressions/1000 in the second row. Note that if the figures rounded up to 2 digits will end up as $0.00. That however doesn't mean that you didn't earn anything even though the number of clicks is zero, but you earn an amount too small to show in the Earnings report as it was rounded up to 2 digits. You actually earned something from impressions generated which are accumulated and paid to you.

PageRank:

What is page ranking? It's defination is not really different to all but what is said by google?

PageRank relies on the uniquely democratic nature of the web by using its vast link structure as an indicator of an individual page's value. In essence, Google interprets a link from page A to page B as a vote, by page A, for page B. But, Google looks at more than the sheer volume of votes, or links a page receives; it also analyzes the page that casts the vote. Votes cast by pages that are themselves "important" weigh more heavily and help to make other pages "important".

There are many defination of page ranking.In other words, a PageRank results from a "ballot" among all the other pages on the World Wide Web about how important a page is. A hyperlink to a page counts as a vote of support. The PageRank of a page is defined recursively and depends on the number and PageRank metric of all pages that link to it.Mainly incoming link. A page that is linked to by many pages with high PageRank receives a high rank itself. If there are no links to a web page there is no support for that page.

As google assigns a numeric weighting from 0-10 for each webpage on the Internet; this PageRank denotes a site’s importance in the eyes of Google. The scale for PageRank is logarithmic like the Richter Scale and roughly based upon quantity of inbound links as well as importance of the page providing the link.

There are numerous academic papers concerning PageRank have been published since Page and Brin's original paper.In practice, the PageRank concept has proven to be vulnerable to manipulation and extensive research has been devoted to identifying falsely inflated PageRank and ways to ignore links from documents with falsely inflated PageRank.So be aware about page ranking.Many people do not know about page ranking so they couldn't do so with their site.
Read More : How page Rank Calculated

So be aware about page ranking. Increase your page rankings through your knowledge.
-Arifin Hossain
Bangladesh,Dhaka.