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网络营销/电子商务词典：搜索引擎/互联网基础应用相关词汇（R）
【说明】：下列词汇为网上营销新观察通过多个网站的相关资源整理汇总，并未一一核对词汇内容的准确性，对词汇的解释不代表本站的观点，仅供初步参考，如需要严格考证词汇的意义，请参考互联网相关的专业词典。
ranking
Referring to the position of a web page on the search results
for a particular query. For example, a page that is listed
third for the term "bubblegum" is said to have
a ranking of 3 for that term.
RealNames
An alternative web site address system whereby particular
words could be registered and pointed to actual URLs. The
system is no longer in use. It relied heavily on support
from Microsoft. When Microsoft decided to discontinue their
support, the RealNames system simply did not have the reach
it needed to work.
recall
A measure of a search engine's ability to return all relevant
results. Search engines must find a balance between recall
and precision (The measure of a search engine's ability
to return only relevant results). If there are 10 pages
about "blue bananas" in a search engine's database
and a search for "blue bananas" returns only 8
of those pages, the recall is scored at 0.8 or 80%. It's
important to note that recall has nothing to do with database
size. If another search engine has only 3 pages about blue
bananas and returns all 3, its recall is 100%, even though
there are other relevant documents not included in its database.
reciprocal link
A link placed on site A, pointing to site B, on the condition
that site B returns the favor. Also called a link swap.
Contrary to popular belief, reciprocal linking does not
necessarily improve a site's PageRank. In some cases it
can have a negative effect on PageRank. For a detailed discussion
on how and when to swap links as well as getting the most
out of PageRank, please refer to the Search Engine Yearbook.
Also see deep linking.
redirect
Users can be redirected from one page to another either
by asking them to click on a link or by means of automatic
redirection, most often done with the meta refresh tag.
Automatic redirection has been misused to the point where
most search engines now penalize sites that use it, typically
by de-listing the offending site.
referrer
When a user follows a link from page A to page B, page A
is called the referrer. The referrer is identified by the
URL of the referring page. Referrer information can be accessed
through the log file.
refresh / refresh tag
See meta refresh
registration
See submission
relevance / relevancy
The measure of the accuracy of the search results - in other
words it's a measure of how close the documents listed in
the search results are to what the user was looking for.
The ability to return relevant results is a big thing in
the search engine world - and arguably the one thing that
made Google stand out of the crowd and gain much popularity
in a short time.
Also see precision and recall.
relevancy algorithm
See algorithm
re-submission
The process of submitting a web page to a search engine
and then repeating the submission process - either a couple
of times or regularly over a period of time. Contrary to
popular belief, regular re-submission does not improve a
page's ranking and is considered a form of spamdexing by
most search engines. For more on this and other common SEO
mistakes, please refer to the Search Engine Yearbook.
results list
See SERP
robot
A browser-like program that automatically request web pages
in order to index the page content (in the case of spiders)
or to retrieve specific information (in the case of programs
like e-mail harvesters).
robots.txt / robots text file
A text file (with the ".txt" extension) that tells
spiders which pages it may not index. Every time a spider
(that complies with the Robots Exclusion Standard) visits
a site it will first request a robots.txt file to see where
in the site it is not allowed to go. The syntax and correct
placing of the robots.txt file as well as an alternative
way to declare pages "off-limits" is discussed
in the Search Engine Yearbook.
ROI
Return On Investment. In the context of SEO, the term refers
to sales generated as the direct result of a search engine
marketing campaign.
R/S ratio
The ratio of the number of web sites which contain a keyword
or keyphrase ("R", the supply) to the number of
search engine searches for that keyword or keyphrase ("S",
the demand). Used as to identify attractive keywords for
which there is little competition.
【说明】：上述词汇为网上营销新观察通过多个网站的相关资源整理汇总，并未一一核对词汇内容的准确性，对词汇的解释不代表本站的观点，仅供初步参考，如需要严格考证词汇的意义，请参考互联网相关的专业词典。
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