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ScreenTek, the largest laptop screen supplier, is featured in TomsHardware.com’s MobilityGuru Online Magazine this month. This extensive article tells the story of the author breaking his laptop LCD screen and how ScreenTek got him up and running again. The story includes a two minute high definition video, created by the author, showing how easy it is for customers to install their own LCD replacement screen and an informative interview with ScreenTek’s marketing director.
Bill Rice
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Links 101: How PageRank Is Calculated Last month we touched on webpage link value or PageRank, which is Google’s methodology for determining the webpage link value of a webpage. For our discussion purposes we will discuss Google’s PageRank methodology as a proxy for explaining how webpage link value is calculated for other search engines due to the availability of information and the importance of Google. Getting Started To determine the PageRank of a website, you must download and install the Google Toolbar. You can do so by visiting http://toolbar.google.com. Once the toolbar is installed, there will be a small bar graph at the top of the browser window showing the PageRank. If you hold your mouse over the PageRank icon, it will show a number between one and ten. This is the website’s PageRank. How To Calculate PageRank Along with most of Google’s mysteries, the PageRank displayed is just a proxy for the actual PageRank. The number that is shown on the toolbar is just a whole number representation of a webpage’s actual page rank. If your website is given a PageRank of 4, the actual PageRank might be in the range of 126-625, for example. A PageRank of 5 might actually be between 626-15,625. As you can see, the difference between 126 and 625 is smaller than the difference between 626 and 15,625, which means that it becomes increasingly difficult to raise your displayed PageRank. But, what do all these numbers mean? There is a complicated calculation that Google uses to determine PageRank, but for our purposes, we are going to break it down to a rather simple formula. Before Google was an actual search engine, it was just a university project authored by the creators of Google, Sergey Brin and Larry Page. Their formula to calculate PageRank was published in their Stanford graduate thesis paper. Surely the formula has changed since, but it gives us a good idea how Google calculates PageRank today. A webpage’s PageRank is calculated approximately every four to six weeks after a website has been crawled and included in Google’s index.Google assigns every web page with the same base number. It then crawls all the websites of the Internet in its index to determine the number of both inbound and outbound links of every webpage. Google then calculates the PageRank being “given” by each webpage and then the PageRank being received by each webpage. It is irrelevant whether these links are pointing to other web pages within the same website or a webpage of a different website. Google first calculates the PageRank “given” by every webpage in its index. When a link passes or "gives" webpage link value, it does not reduce the PageRank of the "giving" webpage. To do this, Google takes the base number that is assigned to every webpage by Google and then divides this base number by all the outbound links on that webpage. So obviously the more outbound links on a webpage, the less PageRank being “given” by each outbound link. Google then calculates the PageRank being received by every webpage in its index. To do this, Google sums the PageRank of every inbound link pointing to the webpage. To put it another way, Google takes PageRank it calculated for every outbound link mentioned above and sums these values that correspond to the inbound links pointing to a webpage. One can see that this process is circular since the web pages receiving inbound links also have links pointing out to other pages. So, Google goes through an iterative process to recalculate PageRank for each webpage. Each recalculation increases the PageRank of a website, but by less and less until the incremental increase is approximately zero. Because this is a circular process, Google includes a factor in its formula called a dampening factor so that the calculation is not calculated an infinite number of times. In our next issue, we will discuss why search engines value links. Future Link Topics:what are the benefits of links, types of links and link acquisition strategies.
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ScreenTek's mission is to be the most competitively-priced, customer service-oriented and extensively-stocked LCD screen supplier for laptop and industrial uses. We have the most extensive LCD screen inventory from multiple screen manufacturers to meet your short- and long-term needs. We focus on strong customer relationships, expedited shipping and featuring a multi-lingual staff.
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