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April 2004
Search Engine Optimisation,
What is Pagerank?
Google's Pagerank, needs to be understood
by top web site designers who aim to promote and build a scalable,
highly targeted web site using regular listings on search
engines like Google. The distribution and navigation of your
site, along with the web site architecture is important to
correct and proper web sites.
Page rank is what google use amongst other things to identify
your web sites value or importance. Google still use and constantly
change/update or modify other varables that effect how a site
is ranked on Search Engines.
Despite this some web sites hardly never lose position, what
makes these sites different? Probably because the web site
designers have designed the site around the many varables
in use by Google. This is the only way to ensure long-term
regular positions in competitive keyword markets. The other
alternative is PPC the balance between the two ultimately
comes down to cost and timescales.
Page rank is something that can change as new sites expand
and more sites become visable to search engine robots. This
is why search engine maintenance or search engine management
(SEM) needs to be carried out to ensure maximum exposure is
met each month on search engines. The algorithms are becoming
constantly harder to crack and change all the time, sometimes
these changes are minor sometimes they are major. If a site
is built correctly and has a good SEM program it should be
rated constanly in many cases.
Also many people confuse page ranking with tool bar ranking,
the two sums are completely different. Page ranking is a mathimatical
sum of your web site and could range well passed a 100 million
in terms of a figure. Tool bar ranking summerises the scales
into a fixed number between 1 and 10. Each link to a site
from outside it's own domain is considered a back link, infact
even local links to a page are considered a backlink.
Some
more search engine optimisation basics
The vote sum equation if you like looks like this:
PR(A) = (1-d) + d (PR(T1)/C(T1) + ... + PR(Tn)/C(Tn))
PR(Tn) - Each page has a notion of its own self-importance.
That’s “PR(T1)” for the first page in the
web all the way up to “PR(Tn)” for the last page
C(Tn) - Each page spreads its vote out evenly amongst all
of it’s outgoing links. The count, or number, of outgoing
links for page 1 is “C(T1)”, “C(Tn)”
for page n, and so on for all pages.
PR(Tn)/C(Tn) - so if our page (page A) has a backlink from
page “n” the share of the vote page A will get
is “PR(Tn)/C(Tn)”
d(... - All these fractions of votes are added together but,
to stop the other pages having too much influence, this total
vote is “damped down” by multiplying it by 0.85
(the factor “d”)
(1 - d) - The (1 – d) bit at the beginning is a bit
of probability math magic so the “sum of all web pages'
PageRanks will be one”: it adds in the bit lost by the
d(.... It also means that if a page has no links to it (no
backlinks) even then it will still get a small PR of 0.15
(i.e. 1 – 0.85). (Aside: the Google paper says “the
sum of all pages” but they mean the “the normalised
sum” – otherwise known as “the average”
to you and me.
How is PageRank Calculated?
The PR of a page is made up by the PR from the pages that
point to it, Google actually say: PageRank or PR(A) can be
calculated using a simple iterative algorithm, and corresponds
to the principal eigenvector of the normalized link matrix
of the web.
To see how this works in detail, please visit this
link.
To download google's page ranking toolbar, please visit this
link
To understand the way this works we recommend you read it,
understand it and then implement it to any web site design.
To rank correctly you need a good page rank in many cases.
Google
Technical Facts!
Google
Changes
Web Site Ranking Explained,
Web
Site Submission, Search
Engine Optimisation Basics,
Internet
Advertising, Google Search Engine Optimisation
Guidlines,
Flash
Intros, Website Templates
Search engine marketing is needed to successfully place your site on sites such as Google, Yahoo etc. unless you use PPC. If you are a long term PPC client the SEO will be better for your business longterm.
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