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Dan Grossman
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Joined: 01 May 2004
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 Posted: Sat May 01, 2004 10:02 pm Post subject: Google's New LocalRank Algorithm |
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LocalRank's officially no longer an unofficial algorithm. Huh? People have suspected such a thing existed for a while, and it probably has, as last week the patent for LocalRank became available (it was filed in January).
What's LocalRank? Reranking sites in response to a search result based on the links to each site from only the sites that matched that search. In other words, link farms and swapping with every site on the Net won't do you any good unless those sites are about topics related to yours. Building natural links between your site and others that are actually useful is once again as important as it should be.
This explains most of the ranking changes in 2004, really, including the increase in spam in the results. Why? Because if you're spamming with multi-IPs and multi-domain sites and crosslinking them, you now get even more of a ranking bonus thanks to LocalRank. Eventually Google must come up with a way to return relevant results without the spam... or it'll lose out to someone else who can. |
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Dan Grossman
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| Posted: Sat May 01, 2004 10:04 pm Post subject: |
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| I was slightly misleading when I said swapping with unrelated sites wouldn't do you any good, as you can still route that PR through your own site for incoming anchor text. However, outside links on related sites are still a priority. |
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intelliot
Site Admin
Joined: 01 May 2004
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| Posted: Sun May 02, 2004 1:12 pm Post subject: Re: Google's New LocalRank Algorithm |
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| Dan Grossman wrote: | | Because if you're spamming with multi-IPs... |
Are different IPs necessary for a link to count? What if a site links to another legitimately separate but related website, and they happen to be on the same server? |
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gminor
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Joined: 29 May 2004
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| Posted: Sun May 30, 2004 12:54 pm Post subject: |
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| I know this post is almost a month old, but what if the link was to a subdomain? I'm not sure if that's a stupid question or not because I'm not exactly sure where subdomains are in the hierarchy of things. |
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algodon
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Joined: 23 May 2004
Location: United Kingdom
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| Posted: Wed Jun 02, 2004 3:49 am Post subject: LocalRank |
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| Hi! Can anyone suggest an informative website that I can go to read more about LocalRank. Thx. |
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intelliot
Site Admin
Joined: 01 May 2004
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| Posted: Wed Jun 02, 2004 9:30 pm Post subject: |
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| Quote: | It's a device constructed to yield better results and (repeat quote):
... prevent any single author of web content from having too much of an impact on the ranking value.
I have been looking at the patent for a while and this intention could very well be inforced by it. That is, if "authorship" is equal to "domain ownership", or "some unspecified network of affiliated authors".
Here goes:
The LocalScore, or Local Rank, is both a filter and a ranking mechanism. It only considers pages among the 1000 or so selected by the PR.
1. The first step in calculating Local Rank for a page is to locate all pages that have outbound links to this page. All pages among the top 1000 that is.
2. Next, all pages that are from the same host as<tis page or from "Similar or affiliated hosts" gets thrown away. Yes. By comparing any two documents within the set, the one having the smallest PR will always be thrown away, until there is only one document left from the (quote) "same host or similar" as the document that is currently being ranked.
Here, "same host" refers to three octets of the IP. That means the first three quarters of it. In other words, these IPs are the same host:
111.111.111.0
111.111.111.255
"Similar or affiliated hosts" refers to mirrors or other kinds of pages that (quote) "contain the same or nearly the same documents". This could be (quote) "determined through a manual search or by an automated web search that compares the contents at different hosts". Here's another patent number for the curious: 5,913,208 (June 15, 1999)
That is: Your on-site link structure means zero to LR. Linking to and from others on the same IP means zero. Near-duplicate pages means zero. Only one page from your "neigborhood", the single most relevant page, will be taken into account.
3. Now, the exact same procedure is repeated for each "host" in the set, until each "host/neigborhood" has only one page left in the set.
4. After this (tough) filtering comes another. Each of the remaining pages have a PR value that they are sorted according to. The top k pages pass, the rest gets thrown away. Here "k" is (quote) "a predetermined number (e.g., 20)."
So, although you positively know that you have 1,234 inbound links, only the top "k" of these, that are not from "your neighborhood" or even "part of the same neigborhood" will count.
5. The remaining pages are called the "BackSet". Only at this stage can the LR be calculated. It's pretty straightforward, but then again, the filtering is tough (quote, although not verbatim, but deviations keep current context):
LocalRank = SUM(i=1-k) PR(BackSet(i))m
Again, the m is one of those annoying unknowns (quote): "the appropriate value at which m should be set varies based on the nature of the OldScore values" (OldScore being PR). It is stated, however, that (quote) "Typical values for m are, for example, one through three". |
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Dan Grossman
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Joined: 01 May 2004
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| Posted: Thu Jul 01, 2004 9:08 pm Post subject: |
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| As I said, if they are following the patent, they don't help your LocalRank. The fact that links within sites of the same class C are excluded from LocalRank doesn't mean they don't help you in other parts of the algorithm or in computing your normal PR. |
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neno.tu
Google Freak
Joined: 10 Oct 2004
Location: Caracas - Venezuela
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| Posted: Sun Oct 10, 2004 10:34 pm Post subject: |
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But are there other variables about Rank???
I've seen pages that are firts in rank and they don't have that much of a content refered to my keywords...
I mean the site mostly is an other crappy search engine of the hundreds in the web...
Can anyone explain this to me???
Thnx
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jacksasha
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cvrk3
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jacksasha
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| Posted: Tue Apr 26, 2005 7:02 am Post subject: |
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Is it possible to get source code for google-pagerank.php?
Script works well, but I'd like to know what it do. May be admin can help me.
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dog1
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tillo
Noogle
Joined: 13 Jun 2006
Location: Switzerland
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| Posted: Tue Jun 13, 2006 4:25 am Post subject: |
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| jacksasha wrote: | Is it possible to get source code for google-pagerank.php?
Script works well, but I'd like to know what it do. May be admin can help me. |
You can check my fork, but as the original site writes, the code doesn't work anymore.
I'm still looking for a wide-working code. |
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cruocitae
The Psychohistorist
Joined: 05 Mar 2006
Location: Terminus
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| Posted: Tue Jun 13, 2006 8:12 am Post subject: |
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| tillo wrote: | | jacksasha wrote: | Is it possible to get source code for google-pagerank.php?
Script works well, but I'd like to know what it do. May be admin can help me. |
You can check my fork, but as the original site writes, the code doesn't work anymore.
I'm still looking for a wide-working code. |
Man, the source!
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"Circles have no end!"
-- Arkady Darrell |
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tillo
Noogle
Joined: 13 Jun 2006
Location: Switzerland
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| Posted: Tue Jun 13, 2006 1:43 pm Post subject: |
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| Sorry, I forgot to point out that you have to simply change .php with .phps |
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