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jaakop
Joined: Jan 13, 2004
# Posts: 4
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Posted: 2004-Mar-30 16:13
Hello,
I was wondering what criteria does DMOZ use to determine what websites get displayed on the first page when a particular search phrase is typed in?
Example: If I type is "online widgets", how will DMOZ determine what websites to list in the top 20 search results that are shown.
I noticed that things such as having the keywords in the description, title, and URL help... but haven't noticed a clear pattern.
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windharp
Joined: Mar 11, 2002
# Posts: 513
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Posted: 2004-Mar-30 19:14
Random. ODP Search does not implement any ranking.
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g1smd
Staff
Joined: Jul 28, 2002
# Posts: 10438
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Posted: 2004-Mar-30 21:52
You should be using search only to find relevant categories which you can then browse through.
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jaakop
Joined: Jan 13, 2004
# Posts: 4
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Posted: 2004-Mar-31 16:38
The reason why I'm interested in this is because I figure that there would be alot of traffic going to the sites that are listed below the relevant categories that come up after a search.
I did some tests and it appears the search results are not random every time I do a search. The same sites always come up. If it's random, how often would this "random algorithm" change so that the returned sites would be different for a particular search?
For example, I did a search for <online books> and Inkling Books website is always the first one, even after repeating the search several times. I noticed that it had something that the other 175 sites listed in the category didn't. They had the term <books> in their site title and twice in the description. There was only one other website that had three occurrences of <books> in their listing, but they were all in the description and not in the title.
To me it would seem that DMOZ has some sort of an algorithm to determine which website gets displayed...based on the title, description and maybe even url. Am I totally wrong?
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windharp
Joined: Mar 11, 2002
# Posts: 513
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Posted: 2004-Mar-31 16:54
My "random" should just mean "in no way that is predictable/influencable".
Speaking technically: Basically search is done from a separate database (not the live ODP data) that is generated from the RDF file on a weekly basis (or at least when the RDF generation does not die). Search results are presented in the order they are in the search database. That order may or may not be related to the structure of the RDF file. The order in the RDF is the same the crawler finds them when converting the ODP to RDF-format.
Putting the technical view aside, the only thing that really matters is: There is no way to influence the order. Neither for someone on the outside nor for an editor.
To me it would seem that DMOZ has some sort of an algorithm to determine which website gets displayed
Nothing beyond "Put all websites containing the search term in a list and display the first <n>"
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g1smd
Staff
Joined: Jul 28, 2002
# Posts: 10438
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Posted: 2004-Mar-31 18:58
What windharp said.
You get the same result every time, but there is no way to predict where any particular listing may appear in the list.
The output is random in that sense, but fixed in order; but the actual order cannot be determined in advance.
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jaakop
Joined: Jan 13, 2004
# Posts: 4
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Posted: 2004-Apr-01 19:49
Thanks for your explanations, they made things very clear. An other question: How can I find out if a particular URL already exists in DMOZ? I tried simply doing a search with the url in the search field, but that doesn't appear to work.
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g1smd
Staff
Joined: Jul 28, 2002
# Posts: 10438
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Posted: 2004-Apr-01 21:57
Search for domain.com without http or even www in it.
Due to the ongoing UTF-8 conversion there were about 22 000 corrupted entries (out of 4 000 000 entries) that might not show up properly in search at the moment.
All but 140 were fixed just before the next RDF dump was started on Monday, and which should complete today or tomorrow. The rest will be fixed shortly.
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